Open Source Projects using C

Seafile

Self-hosted file sync with AI-powered organization

Stars
14,615
Forks
1,637
Last commit
7 days ago

Open source file sync and sharing platform with custom properties, AI automation, collaborative editing, and enterprise-grade security for teams.

Open Source Alternative to:

Convex

Build full-stack apps with TypeScript and real-time sync

Stars
11,349
Forks
688
Last commit
13 hours ago

Open-source reactive database that keeps your web and mobile apps in sync. Write everything in TypeScript with built-in auth, cron jobs, and AI integration.

Open Source Alternative to:

Supabase

OpenReplay

Self-hosted session replay with complete data control

Stars
11,971
Forks
728
Last commit
23 hours ago

Open-source session replay and product analytics platform you can self-host for complete control over data security, privacy, and compliance.

Open Source Alternative to:

June

Shotcut

A free, open source, cross-platform video editor

Stars
13,778
Forks
1,336
Last commit
2 days ago

Free, open-source video editor supporting 4K resolution, hundreds of formats, and professional features like Blackmagic Design integration across Windows, Mac, and Linux.

Open Source Alternative to:

CapCut

OceanBase

High-performance distributed database for all workloads

Stars
10,070
Forks
1,886
Last commit
13 hours ago

Scalable, high-availability database system supporting OLTP, OLAP, and hybrid transactional/analytical processing workloads.

Open Source Alternative to:

Fauna

Sure.am

The personal finance app for everyone

Stars
7,831
Forks
870
Last commit
24 hours ago

An all-in-one personal finance platform. Track, optimize, grow, and manage your money through every stage of life.

Open Source Alternative to:

YNAB

Darktable

Professional RAW photo editing and workflow management

Stars
12,292
Forks
1,304
Last commit
13 hours ago

Open source photography workflow application for RAW development. Non-destructive editing, professional color management, and GPU acceleration for photographers.

Open Source Alternative to:

Manticore Search

Lightning-fast open source search engine for big data

Stars
11,761
Forks
624
Last commit
8 hours ago

Open source search database delivering 2.83x faster performance than Elasticsearch. Features vector search, SQL interface, and full-text capabilities.

Open Source Alternative to:

Algolia

NHost

Serverless backend platform for modern app development

Stars
9,132
Forks
567
Last commit
24 hours ago

Fully managed backend infrastructure with built-in authentication, database, storage, and serverless functions for rapid application development.

Open Source Alternative to:

Supabase

Activeloop

The tensor database for AI data

Stars
9,097
Forks
710
Last commit
2 months ago

Deep Lake is an open-source database for storing, querying and managing complex AI data like images, audio, and embeddings.

Open Source Alternative to:

Snowflake

Builder

Visual development platform for modern web experiences

Stars
8,659
Forks
1,149
Last commit
12 hours ago

Drag-and-drop interface for creating and optimizing digital experiences, with headless CMS and powerful integrations.

Open Source Alternative to:

WordPress

Krita

Professional digital painting made accessible to everyone

Stars
9,644
Forks
768
Last commit
9 hours ago

Free and open source painting program built by artists for artists. Features professional brushes, layers, animation tools, and drawing assistants for all skill levels.

Open Source Alternative to:

Photoshop

FireZone

Fast, flexible VPN replacement with zero-trust security

Stars
8,584
Forks
412
Last commit
10 hours ago

Replace your VPN with zero-trust access built on WireGuard. Fast, scalable network security with simple policies and identity provider integration.

Open Source Alternative to:

Teleport

Expensify

Simplify expense management for businesses of all sizes

Stars
4,831
Forks
3,725
Last commit
9 hours ago

Automate expense reporting, reimbursements, and corporate card management with real-time data sync and powerful integrations.

Tuta

Secure email, calendar and contacts with end-to-end encryption

Stars
7,495
Forks
611
Last commit
22 hours ago

Tuta offers encrypted email, calendar and contacts with quantum-resistant security, protecting your privacy without ads or tracking.

Open Source Alternative to:

Gmail

Standard Notes

Secure, encrypted notes for your digital life

Stars
6,419
Forks
530
Last commit
11 hours ago

Cross-platform note-taking app with end-to-end encryption, offline access, and powerful organization features for privacy-conscious users.

Open Source Alternative to:

Obsidian

GIMP

Professional image editing without the price tag

Stars
6,108
Forks
863
Last commit
12 hours ago

Free, open-source image editor with professional tools for photo manipulation, digital art creation, and graphic design. Cross-platform support.

Open Source Alternative to:

Photoshop

Grit

Automated technical debt reduction for software teams

Stars
4,483
Forks
122
Last commit
3 days ago

Grit uses machine learning and static analysis to automatically generate pull requests that clean up code and migrate to the latest frameworks.

Kdenlive

Professional video editing without the price tag

Stars
4,927
Forks
406
Last commit
12 hours ago

Cross-platform non-linear video editor offering professional features for free. Edit videos on Linux, Windows, macOS, and BSD with advanced tools and effects.

Open Source Alternative to:

CapCut

Collabora Online

Open-source document editing suite for secure collaboration

Stars
3,178
Forks
1,002
Last commit
9 hours ago

Powerful online document editor with Microsoft Office compatibility. Integrate into your infrastructure or use trusted hosting partners for secure team collaboration.

Open Source Alternative to:

Memgraph

High-performance graph computing for scalable data analysis

Stars
3,938
Forks
221
Last commit
21 hours ago

Memgraph is a scalable, in-memory graph database solution offering high-performance computing and Neo4j compatibility.

Open Source Alternative to:

MongoDB

LibreOffice

Free office suite with Microsoft compatibility

Stars
3,870
Forks
817
Last commit
9 hours ago

Complete free office suite compatible with Microsoft formats (.doc, .docx, .xls, .xlsx, .ppt, .pptx). Open source alternative with regular updates.

Open Source Alternative to:

OpenWispr

Transform speech to text instantly with AI privacy

Stars
2,618
Forks
363
Last commit
10 hours ago

Open source AI voice dictation that processes locally or uses your API keys. 3x faster than typing with smart text cleanup and universal app compatibility.

Open Source Alternative to:

Wispr Flow

RawTherapee

Professional raw photo processing made free and powerful

Stars
3,905
Forks
386
Last commit
5 days ago

Free, cross-platform raw image processor with 32-bit floating point engine, advanced demosaicing algorithms, and professional-grade editing tools for photographers.

Open Source Alternative to:

Anthias

Transform any TV into professional digital signage

Stars
3,493
Forks
705
Last commit
8 hours ago

Free open-source digital signage software that turns Raspberry Pi or old PCs into powerful display solutions. Manage images, videos, and web content easily.

Open Source Alternative to:

OptiSigns

Opengrep

Open-source code security engine for developers

Stars
2,424
Forks
198
Last commit
20 hours ago

Opengrep is a community-driven fork of SemgrepCE, providing accessible static code analysis and security scanning for developers.

Stars
Forks
Last commit

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Forks
Last commit

Stars
Forks
Last commit

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Forks
Last commit

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Forks
Last commit

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Forks
Last commit

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Ceph

Scalable open-source distributed storage system

Stars
16,498
Forks
6,362
Last commit
10 hours ago

Ceph provides unified object, block, and file storage from a single cluster built on commodity hardware.

Open Source Alternative to:

Amazon S3

Windmill

Open-source workflow automation for developers

Stars
16,300
Forks
930
Last commit
13 hours ago

Powerful, self-hosted platform for building and running workflows, scripts, and apps with code-first approach and collaborative features.

Open Source Alternative to:

Make

Turso

SQLite-compatible database for scalable multi-tenant applications

Stars
16,634
Forks
486
Last commit
29 days ago

Turso provides a simple developer experience with SQLite compatibility, allowing you to build and scale multi-tenant applications with unlimited databases.

Open Source Alternative to:

Supabase

Plandex

AI coding agent that handles large-scale development tasks

Stars
15,278
Forks
1,123
Last commit
7 months ago

Terminal-based AI coding assistant with 2M token context window, diff review sandbox, and smart context management for building production-ready software.

Open Source Alternative to:

Claude Code

QuestDB

High-performance time-series database for massive data scale

Stars
16,884
Forks
1,564
Last commit
10 hours ago

Open-source time-series database offering massive ingestion throughput, millisecond queries, and SQL extensions, designed for optimal performance at any hardware scale.

Open Source Alternative to:

MongoDB

iTerm 2

Advanced terminal with modern features for Mac developers

Stars
17,448
Forks
1,363
Last commit
15 hours ago

Feature-rich terminal replacement for macOS with split panes, search, autocomplete, and extensive customization options for enhanced productivity.

Open Source Alternative to:

Warp

Formbricks

Privacy-first surveys that respect your data ownership

Stars
12,121
Forks
2,215
Last commit
8 hours ago

Open source experience management platform for gathering user feedback on websites and apps. GDPR-compliant with self-hosting options and seamless integrations.

Open Source Alternative to:

Google Forms

Weaviate

AI-native vector database for intuitive applications

Stars
16,060
Forks
1,261
Last commit
8 hours ago

Open-source vector database designed for building powerful, production-ready AI applications with hybrid search capabilities and flexible deployment options.

Open Source Alternative to:

Supabase

Logstash

Centralize, transform, and stash your data

Stars
14,839
Forks
3,501
Last commit
18 hours ago

Logstash is a free and open server-side data processing pipeline that ingests data from multiple sources, transforms it, and sends it to your desired destination.

Open Source Alternative to:

DataDog

Organic Maps

Privacy-first offline maps for hiking, cycling & navigation

Stars
13,745
Forks
1,371
Last commit
10 hours ago

Free, open-source offline maps app with detailed trails, turn-by-turn navigation, and zero tracking. Perfect for hikers, cyclists, and travelers seeking privacy.

Open Source Alternative to:

Google Maps

Meetily

The Ai Note taker for your confidential meetings

Stars
11,250
Forks
1,096
Last commit
1 month ago

Open source AI meeting note taker with local transcription and summaries. Works with Google Meet, Zoom, Teams. 100% private, self-hosted solution.

Open Source Alternative to:

Granola

Notesnook

Secure, private note-taking for the digital age

Stars
13,953
Forks
941
Last commit
8 hours ago

End-to-end encrypted note-taking app with cross-platform sync, rich text editing, and offline support for ultimate privacy and productivity.

Open Source Alternative to:

Notion

Pearcleaner

A free but powerful Mac app cleaner

Stars
12,561
Forks
298
Last commit
3 months ago

A free Mac app cleaner that removes leftover files, strips universal app architectures, manages launch agents, and includes Finder integration with drag/drop support.

Open Source Alternative to:

CCleaner

OpenVPN

Zero Trust VPN solutions for secure business networking

Stars
13,572
Forks
3,288
Last commit
10 hours ago

Secure remote access VPN solutions with zero trust network access. Self-hosted and cloud-managed options for businesses of all sizes. Trusted by 20,000+ organizations.

Open Source Alternative to:

Teleport

Gitpod

Cloud-based development environments, ready in seconds

Stars
13,661
Forks
1,376
Last commit
1 day ago

Standardized, automated dev environments in the cloud. Self-host or use managed service. Integrate with existing tools and workflows.

Open Source Alternative to:

BitBucket

Filestash

Unified file management for your enterprise storage

Stars
14,093
Forks
976
Last commit
1 day ago

Filestash is an open-source file manager that integrates with multiple storage backends, authentication systems, and offers customization options.

Open Source Alternative to:

Seafile

Self-hosted file sync with AI-powered organization

Stars
14,615
Forks
1,637
Last commit
7 days ago

Open source file sync and sharing platform with custom properties, AI automation, collaborative editing, and enterprise-grade security for teams.

Open Source Alternative to:

Convex

Build full-stack apps with TypeScript and real-time sync

Stars
11,349
Forks
688
Last commit
13 hours ago

Open-source reactive database that keeps your web and mobile apps in sync. Write everything in TypeScript with built-in auth, cron jobs, and AI integration.

Open Source Alternative to:

Supabase

OpenReplay

Self-hosted session replay with complete data control

Stars
11,971
Forks
728
Last commit
23 hours ago

Open-source session replay and product analytics platform you can self-host for complete control over data security, privacy, and compliance.

Open Source Alternative to:

June

Shotcut

A free, open source, cross-platform video editor

Stars
13,778
Forks
1,336
Last commit
2 days ago

Free, open-source video editor supporting 4K resolution, hundreds of formats, and professional features like Blackmagic Design integration across Windows, Mac, and Linux.

Open Source Alternative to:

CapCut

OceanBase

High-performance distributed database for all workloads

Stars
10,070
Forks
1,886
Last commit
13 hours ago

Scalable, high-availability database system supporting OLTP, OLAP, and hybrid transactional/analytical processing workloads.

Open Source Alternative to:

Fauna

Sure.am

The personal finance app for everyone

Stars
7,831
Forks
870
Last commit
24 hours ago

An all-in-one personal finance platform. Track, optimize, grow, and manage your money through every stage of life.

Open Source Alternative to:

YNAB

Darktable

Professional RAW photo editing and workflow management

Stars
12,292
Forks
1,304
Last commit
13 hours ago

Open source photography workflow application for RAW development. Non-destructive editing, professional color management, and GPU acceleration for photographers.

Open Source Alternative to:

Manticore Search

Lightning-fast open source search engine for big data

Stars
11,761
Forks
624
Last commit
8 hours ago

Open source search database delivering 2.83x faster performance than Elasticsearch. Features vector search, SQL interface, and full-text capabilities.

Open Source Alternative to:

Algolia

NHost

Serverless backend platform for modern app development

Stars
9,132
Forks
567
Last commit
24 hours ago

Fully managed backend infrastructure with built-in authentication, database, storage, and serverless functions for rapid application development.

Open Source Alternative to:

Supabase

Activeloop

The tensor database for AI data

Stars
9,097
Forks
710
Last commit
2 months ago

Deep Lake is an open-source database for storing, querying and managing complex AI data like images, audio, and embeddings.

Open Source Alternative to:

Snowflake

Builder

Visual development platform for modern web experiences

Stars
8,659
Forks
1,149
Last commit
12 hours ago

Drag-and-drop interface for creating and optimizing digital experiences, with headless CMS and powerful integrations.

Open Source Alternative to:

WordPress

Krita

Professional digital painting made accessible to everyone

Stars
9,644
Forks
768
Last commit
9 hours ago

Free and open source painting program built by artists for artists. Features professional brushes, layers, animation tools, and drawing assistants for all skill levels.

Open Source Alternative to:

Photoshop

FireZone

Fast, flexible VPN replacement with zero-trust security

Stars
8,584
Forks
412
Last commit
10 hours ago

Replace your VPN with zero-trust access built on WireGuard. Fast, scalable network security with simple policies and identity provider integration.

Open Source Alternative to:

Teleport

Expensify

Simplify expense management for businesses of all sizes

Stars
4,831
Forks
3,725
Last commit
9 hours ago

Automate expense reporting, reimbursements, and corporate card management with real-time data sync and powerful integrations.

Tuta

Secure email, calendar and contacts with end-to-end encryption

Stars
7,495
Forks
611
Last commit
22 hours ago

Tuta offers encrypted email, calendar and contacts with quantum-resistant security, protecting your privacy without ads or tracking.

Open Source Alternative to:

Gmail

Standard Notes

Secure, encrypted notes for your digital life

Stars
6,419
Forks
530
Last commit
11 hours ago

Cross-platform note-taking app with end-to-end encryption, offline access, and powerful organization features for privacy-conscious users.

Open Source Alternative to:

Obsidian

GIMP

Professional image editing without the price tag

Stars
6,108
Forks
863
Last commit
12 hours ago

Free, open-source image editor with professional tools for photo manipulation, digital art creation, and graphic design. Cross-platform support.

Open Source Alternative to:

Photoshop

Grit

Automated technical debt reduction for software teams

Stars
4,483
Forks
122
Last commit
3 days ago

Grit uses machine learning and static analysis to automatically generate pull requests that clean up code and migrate to the latest frameworks.

Kdenlive

Professional video editing without the price tag

Stars
4,927
Forks
406
Last commit
12 hours ago

Cross-platform non-linear video editor offering professional features for free. Edit videos on Linux, Windows, macOS, and BSD with advanced tools and effects.

Open Source Alternative to:

CapCut

Collabora Online

Open-source document editing suite for secure collaboration

Stars
3,178
Forks
1,002
Last commit
9 hours ago

Powerful online document editor with Microsoft Office compatibility. Integrate into your infrastructure or use trusted hosting partners for secure team collaboration.

Open Source Alternative to:

Memgraph

High-performance graph computing for scalable data analysis

Stars
3,938
Forks
221
Last commit
21 hours ago

Memgraph is a scalable, in-memory graph database solution offering high-performance computing and Neo4j compatibility.

Open Source Alternative to:

MongoDB

LibreOffice

Free office suite with Microsoft compatibility

Stars
3,870
Forks
817
Last commit
9 hours ago

Complete free office suite compatible with Microsoft formats (.doc, .docx, .xls, .xlsx, .ppt, .pptx). Open source alternative with regular updates.

Open Source Alternative to:

OpenWispr

Transform speech to text instantly with AI privacy

Stars
2,618
Forks
363
Last commit
10 hours ago

Open source AI voice dictation that processes locally or uses your API keys. 3x faster than typing with smart text cleanup and universal app compatibility.

Open Source Alternative to:

Wispr Flow

RawTherapee

Professional raw photo processing made free and powerful

Stars
3,905
Forks
386
Last commit
5 days ago

Free, cross-platform raw image processor with 32-bit floating point engine, advanced demosaicing algorithms, and professional-grade editing tools for photographers.

Open Source Alternative to: