Open Source Projects using GitHub
A curated collection of the 282 best open source software using GitHub. Find the most popular and trending open source projects to learn from, contribute to, or use in your own projects.
Get alerted when cron jobs and scheduled tasks miss their run
Stars
10,280Last commit
3 days agoLicense
BSD-3-Clause
Monitors cron jobs, background workers, and scheduled tasks by expecting periodic HTTP pings and alerting you when they stop arriving on time.
Open Source Alternative to:
Privacy-first CAPTCHA alternative with proof-of-work
Stars
7,585Last commit
10 days agoLicense
Apache-2.0
Lightweight open-source CAPTCHA solution using SHA-256 proof-of-work. 250x smaller than hCaptcha, fully customizable, and privacy-focused with zero telemetry.
Open Source Alternative to:
Build and play games inside a game engine that runs live
Stars
6,414Last commit
7 hours agoLicense
MIT
A game creation platform built on Valve's Source 2 engine, letting you build, share, and play games without leaving the environment.
Open Source Alternative to:
The tensor database for AI data
Stars
9,227Last commit
3 months agoLicense
Apache-2.0
Deep Lake is an open-source database for storing, querying and managing complex AI data like images, audio, and embeddings.
Open Source Alternative to:
Simplify expense management for businesses of all sizes
Stars
5,011Last commit
3 hours agoLicense
MIT
Automate expense reporting, reimbursements, and corporate card management with real-time data sync and powerful integrations.
Voice-to-text that works offline, privately, on any app
Stars
5,694Last commit
1 day agoLicense
MIT
Dictation app powered by OpenAI Whisper and NVIDIA Parakeet. Runs locally on macOS, Windows, and Linux with zero data retention and 100+ language support.
Open Source Alternative to:
Simple yet powerful CI/CD engine with great extensibility
Stars
7,739Last commit
8 hours agoLicense
Apache-2.0
Open-source CI/CD platform using Docker containers for pipeline execution. Create multiple workflows, extend with plugins, and enjoy free lifetime access.
Open Source Alternative to:
Security-first diagramming with no login required
Stars
7,687Last commit
2 days agoLicense
Apache-2.0
Create professional diagrams online or offline with security-first approach. No registration needed. Works with Google Drive, SharePoint, Atlassian, and more.
Open Source Alternative to:
Dashboard for running multiple coding agents in parallel
Stars
5,483Last commit
9 hours agoLicense
Apache-2.0
Desktop app that runs 25+ coding agents simultaneously, each isolated in its own Git worktree, so you can orchestrate code changes without switching tools.
Open Source Alternative to:
Open-source cloud communications platform for developers
Stars
8,081Last commit
17 hours agoLicense
MIT
Build and deploy powerful voice and messaging applications with ease using Fonoster's flexible, scalable, and developer-friendly platform.
Open Source Alternative to:
Auto-generated network diagrams that stay current
Stars
5,358Last commit
4 days agoLicense
AGPL-3.0
Discovers your network via SNMP, LLDP, and ARP, then builds and maintains L2/L3 topology diagrams, host inventories, and service dependency maps automatically.
Open Source Alternative to:
Unified observability database for metrics, logs, and traces
Stars
6,565Last commit
6 hours agoLicense
Apache-2.0
Cloud-native observability database unifying metrics, logs, and traces with sub-second queries, 50x cost reduction, and seamless OpenTelemetry integration.
Open Source Alternative to:
Secure collaboration with end-to-end encryption
Stars
7,859Last commit
5 hours agoLicense
AGPL-3.0
Open-source collaboration suite offering encrypted document editing, file sharing, and team workspaces with complete privacy protection.
Open Source Alternative to:
Unify vector search and graph traversals in one database
Stars
5,845Last commit
5 hours agoLicense
Apache-2.0
Rust-built native graph-vector database combining vector similarity search and graph traversals. 10x faster development with unified architecture, sub-1ms queries.
Open Source Alternative to:
Time-series database built for industrial IoT workloads
Stars
6,382Last commit
7 hours agoLicense
Apache-2.0
Apache IoTDB manages industrial IoT time-series data with high-throughput read/write, edge-cloud sync, ultra-high compression, and integrations with Hadoop, Spark, Flink, and Grafana.
Open Source Alternative to:
Self-hosted cloud platform with automated security
Stars
6,128Last commit
6 hours agoLicense
Unknown
Complete self-hosting solution with automated maintenance, Smart-Shield protection, anti-DDoS, SSO authentication, and VPN access for secure private cloud management.
Open Source Alternative to:
Complete office suite for documents, spreadsheets & more
Stars
6,848Last commit
1 month agoLicense
AGPL-3.0
Open-source online editor for documents, spreadsheets, presentations, and PDFs. Features real-time collaboration, AI integration, and accessibility tools.
Open Source Alternative to:
Distributed OLAP database for real-time analytics at scale
Stars
6,126Last commit
3 hours agoLicense
Apache-2.0
Sub-second SQL queries on fresh streaming data at petabyte scale, built for high-concurrency user-facing apps and AI agent backends.
Open Source Alternative to:
Build scalable authorization in minutes, not months
Stars
5,939Last commit
15 hours agoLicense
AGPL-3.0
Open-source authorization service for implementing fine-grained access controls. Centralized, scalable solution supporting RBAC, ABAC and ReBAC with Google Zanzibar-inspired architecture.
Open Source Alternative to:
Secure, encrypted notes for your digital life
Stars
6,600Last commit
6 days agoLicense
AGPL-3.0
Cross-platform note-taking app with end-to-end encryption, offline access, and powerful organization features for privacy-conscious users.
Open Source Alternative to:
Self-hosted group chat without recurring subscription fees
Stars
4,517Last commit
5 hours agoLicense
MIT
Install your own group chat system with @mentions, DMs, and mobile support. One-time purchase, no monthly fees. Includes full source code for customization.
Open Source Alternative to:
Desktop SQL client with built-in MCP for AI agent access
Stars
4,197Last commit
1 day agoLicense
Apache-2.0
Desktop database client for PostgreSQL, MySQL/MariaDB, SQLite, and 14+ more databases, with a built-in MCP server, SQL notebooks, visual query builder, and a plugin system.
Open Source Alternative to:
Clean your system and free disk space
Stars
6,680Last commit
5 hours agoLicense
GPL-3.0
BleachBit frees disk space & protects privacy by deleting cache, cookies, history & temp files from Firefox, Chrome & more. Open source for Linux/Windows.
Open Source Alternative to:
Free, cross-platform video editor that's easy to learn
Stars
6,193Last commit
2 days agoLicense
GPL-3.0
A free, open-source video editor for Linux, Mac, and Windows with animation, effects, multi-track editing, and 3D title rendering.
Open Source Alternative to:
Lightweight self-hosted bookkeeping with AI receipt scanning
Stars
5,455Last commit
4 hours agoLicense
MIT
A privacy-first personal finance app with two-level accounts, multi-currency support, AI receipt recognition, and broad data import from formats like GnuCash and Firefly III.
Open Source Alternative to:
Build reliable LLM apps with integrated workflows
Stars
4,525Last commit
3 hours agoLicense
MIT
Open-source LLMOps platform providing prompt management, evaluation, and observability tools for building robust AI applications with team collaboration.
Open Source Alternative to:
Navigate anywhere with detailed offline maps and GPS
Stars
5,924Last commit
3 hours agoLicense
Unknown
Comprehensive offline navigation app with detailed maps, turn-by-turn guidance, and specialized routing for hiking, cycling, and walking worldwide.
Open Source Alternative to:
Enterprise workplace AI with data you own and control
Stars
3,677Last commit
4 hours agoLicense
Apache-2.0
Self-hostable enterprise AI platform that unifies business data across apps, powers a knowledge graph for cited answers, and lets teams build AI agents across their stack.
Open Source Alternative to:
Modern desktop accounting made simple and free
Stars
4,898Last commit
3 months agoLicense
AGPL-3.0
A user-friendly desktop accounting software that helps businesses manage invoices, track expenses, and handle bookkeeping with a modern interface.
Open Source Alternative to:
Free open-source appointment booking for any business
Stars
4,335Last commit
5 days agoLicense
GPL-3.0
Self-hosted appointment scheduling solution with Google Calendar sync, customizable workflows, and no monthly fees. Perfect for healthcare, salons, and service businesses.
Open Source Alternative to:
Browser and notebook combined with local-first AI
Stars
3,538Last commit
3 hours agoLicense
Apache-2.0
A browser that doubles as a personal notebook, letting you research, summarize, and take notes on web pages, PDFs, and videos without switching apps.
Open Source Alternative to:
The definitive self-hosted URL shortener
Stars
5,239Last commit
19 days agoLicense
MIT
Keep control over all your shortened URLs by serving them under your own domains with this simple yet powerful tool.
Open Source Alternative to:
A spreadsheet engine you can embed, self-host, or run in the browser
Stars
4,120Last commit
6 hours agoLicense
Apache-2.0
IronCalc is an open-source, Rust-powered spreadsheet engine with .xlsx support, 300+ functions, and bindings for JavaScript and Python.
Open Source Alternative to:
System-wide ad-blocking and privacy protection, no extensions needed
Stars
4,171Last commit
2 days agoLicense
MIT
Free, open-source desktop app that blocks ads, trackers, and surveillance scripts across all browsers and apps on Windows, macOS, and Linux.
Open Source Alternative to:
Git-native feature management for developers
Stars
4,878Last commit
20 hours agoLicense
GPL-3.0
A feature flag platform that integrates with Git workflows, enabling developers to manage features directly in their codebase.
Open Source Alternative to:
Track coding time effortlessly, gain insights instantly
Stars
4,408Last commit
3 days agoLicense
MIT
Open-source, self-hosted time tracking solution for developers. Analyze coding habits, improve productivity, and visualize progress.
Open Source Alternative to:
Free office suite with Microsoft compatibility
Stars
4,266Last commit
4 hours agoLicense
GPL-3.0
Complete free office suite compatible with Microsoft formats (.doc, .docx, .xls, .xlsx, .ppt, .pptx). Open source alternative with regular updates.
Open Source Alternative to:
Self-hosted photo management with full control
Stars
4,265Last commit
23 hours agoLicense
MIT
Free photo management tool that runs on your server. Upload, organize, and share photos with beautiful interface, EXIF support, and complete privacy control.
Open Source Alternative to:
Feature-rich backend that runs anywhere you need it
Stars
3,751Last commit
5 months agoLicense
Apache-2.0
Lightweight Firebase alternative with database, auth, storage, and workflows. Framework-agnostic backend that integrates with NextJS, Remix, Hono and more.
Open Source Alternative to:
Python, SQL, and AI in a collaborative data notebook
Stars
2,999Last commit
3 hours agoLicense
Apache-2.0
Deepnote is an open-source collaborative notebook for data analysts and scientists, combining Python, SQL, AI assistance, and live sharing in one cloud platform.
Open Source Alternative to:
Open source ecommerce platform for modern businesses
Stars
3,406Last commit
4 hours agoLicense
MIT
A flexible and customizable ecommerce solution that enables businesses to build responsive online stores with advanced features and automation capabilities.
Open Source Alternative to:
Professional raw photo processing made free and powerful
Stars
4,129Last commit
9 days agoLicense
GPL-3.0
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:
Stellar Hosted – Managed Open Source software hosting in the EU: secure, compliant, fast.
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InfluxDB
Capture