Open Source Alternatives to Popular Software
Over 1 million users replaced their proprietary tools with open source software. Discover the best alternatives and join the movement.
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Secure collaboration with end-to-end encryption
Stars
7,993Last commit
22 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:
Secure email, calendar and contacts with end-to-end encryption
Stars
7,984Last commit
21 hours agoLicense
GPL-3.0
Tuta offers encrypted email, calendar and contacts with quantum-resistant security, protecting your privacy without ads or tracking.
Open Source Alternative to:
Automate crypto trading with open-source strategies
Stars
6,682Last commit
6 hours agoLicense
GPL-3.0
OctoBot is an open-source platform for automated cryptocurrency trading, offering customizable strategies and easy integration with exchanges.
Open Source Alternative to:
Self-hosted file sharing built for digital sovereignty
Stars
6,103Last commit
6 hours agoLicense
Apache-2.0
Self-hostable cloud file management and collaboration platform with an integrated office suite, zero-trust security, and GDPR compliance for teams and organizations.
Open Source Alternative to:
Desktop SQL client with built-in MCP for AI agent access
Stars
5,131Last commit
19 hours 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:
Open-source legal AI that law firms control and extend
Stars
4,308Last commit
7 hours agoLicense
AGPL-3.0
Self-hostable alternative to Harvey and Legora with document analysis, contract drafting, tabular review, and reusable workflows. Zero licensing costs, full data control.
Open Source Alternative to:
Launch Your Store in Minutes, No Code Needed
Stars
5,521Last commit
9 hours agoLicense
MIT
Fast, modern e-commerce with instant setup and full customization. Powered by Stripe for seamless transactions.
Open Source Alternative to:
Ad-free photo sharing with privacy and federation
Stars
7,120Last commit
10 hours agoLicense
AGPL-3.0
Decentralized photo sharing platform with chronological feeds, privacy controls, and ActivityPub federation. No ads, no algorithms, just authentic connections.
Open Source Alternative to:
Build stateful backends with in-memory actors
Stars
6,251Last commit
11 hours agoLicense
Apache-2.0
Open-source infrastructure for long-lived, in-memory processes called Actors. Combines state and compute with sub-millisecond latency, realtime capabilities, and horizontal scaling.
Open Source Alternative to:
Transform SQL into beautiful data stories
Stars
6,986Last commit
5 days agoLicense
MIT
Create data-driven websites and reports using SQL and Markdown, with automatic visualizations and interactive elements.
Open Source Alternative to:
Flexible project management you can host yourself
Stars
6,043Last commit
13 hours agoLicense
GPL-2.0
Self-hosted project management web app built on Ruby on Rails with issue tracking, time logging, SCM integration, and multi-project support across any database.
Open Source Alternative to:
Build reliable AI apps with comprehensive observability
Stars
6,203Last commit
21 days agoLicense
Apache-2.0
Open-source platform for logging, monitoring, and debugging LLM applications. Route, debug, and analyze AI apps with comprehensive observability tools.
Open Source Alternative to:
Time-series database built for industrial IoT workloads
Stars
6,404Last commit
23 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:
Organize and secure your documents in one central hub
Stars
5,543Last commit
19 hours agoLicense
AGPL-3.0
A document management platform that helps you archive, organize, and search files with email ingestion, tagging capabilities, and powerful search functionality.
Open Source Alternative to:
Sync and transform data from any source to any destination
Stars
6,537Last commit
19 hours agoLicense
MPL-2.0
CloudQuery is an open-source ELT platform that enables easy data integration from hundreds of cloud and security tools to any destination.
Open Source Alternative to:
Automated translations that scale with your code and commits
Stars
5,405Last commit
2 days agoLicense
Apache-2.0
Transform your app into a global product with AI-powered localization that integrates directly into your development workflow. Supports 83+ languages with Git-native automation.
Open Source Alternative to:
Open source kanban boards with unlimited everything
Stars
5,738Last commit
5 days agoLicense
AGPL-3.0
Free kanban project management with unlimited boards, lists, and cards. Import Trello boards, collaborate with teams, and self-host for complete control.
Open Source Alternative to:
Programmable notes with queries, Lua scripting, and wiki links
Stars
6,237Last commit
23 hours agoLicense
MIT
A self-hosted, browser-based note-taking system that turns plain Markdown pages into a queryable, scriptable knowledge base you control.
Open Source Alternative to:
AI-powered embedded AR/AP automation for platforms
Stars
8,349Last commit
2 years agoLicense
AGPL-3.0
Crater offers AI-driven invoicing workflows, payments, and working capital tools to enhance your platform with minimal technical effort.
Open Source Alternative to:
Self-hosted cloud platform with automated security
Stars
6,178Last commit
1 day 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:
Virtual office platform for engaging remote collaboration
Stars
5,832Last commit
21 hours agoLicense
Unknown
Create customizable virtual workspaces for remote teams to interact naturally, host events, and collaborate through spontaneous conversations and scheduled meetings.
Open Source Alternative to:
Open-source BI for modern data teams
Stars
6,177Last commit
5 hours agoLicense
MIT
Self-serve analytics platform that transforms dbt models into interactive dashboards, enabling data-driven decisions across organizations.
Open Source Alternative to:
Self-hosted Git forge that's lightweight and secure
Stars
5,599Last commit
18 hours agoLicense
Unknown
Self-hosted software forge offering GitHub-like features with minimal resources. Easy installation, low maintenance, and 100% free software for secure project management.
Open Source Alternative to:
Self-hosted group chat without recurring subscription fees
Stars
4,744Last commit
1 day 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:
Smart desktop AI assistant with powerful local knowledge features
Stars
5,370Last commit
23 days agoLicense
Unknown
Cross-platform desktop AI assistant supporting multiple providers, local knowledge base, and custom prompts. Integrates MCP protocol for enhanced AI tool capabilities.
Open Source Alternative to:
Intercept, modify, and debug HTTP(S) requests effortlessly
Stars
6,758Last commit
8 hours agoLicense
AGPL-3.0
A powerful browser extension and desktop app for developers to manipulate network requests, debug APIs, and improve web app testing
Open Source Alternative to:
The open-source, affordable email platform
Stars
5,505Last commit
1 day agoLicense
AGPL-3.0
Plunk unifies marketing, transactional, and broadcast emails into a single, complete solution for businesses of all sizes.
Open Source Alternative to:
A team of AI agents in a chat app, on your own machine
Stars
4,123Last commit
9 hours agoLicense
Apache-2.0
Run a team of AI agents locally on your own API keys and subscriptions, with scheduled tasks, computer use, and Gmail, GitHub and Slack integrations.
Open Source Alternative to:
Enterprise monitoring for networks, apps, and infrastructure
Stars
6,447Last commit
1 day agoLicense
AGPL-3.0
Monitors networks, servers, cloud services, IoT, and OT environments with no per-device licensing fees, available self-hosted or as a managed SaaS platform.
Open Source Alternative to:
Open source cloud infrastructure trusted at massive scale
Stars
6,050Last commit
11 hours agoLicense
Apache-2.0
OpenStack manages compute, storage, and networking across VMs, bare metal, and containers via APIs or a dashboard. Trusted by Walmart, China Mobile, and more.
Open Source Alternative to:
Feature flags and remote config for rapid deployment
Stars
6,590Last commit
12 hours agoLicense
BSD-3-Clause
Powerful feature management platform for seamless software releases, A/B testing, and personalized user experiences.
Open Source Alternative to:
Secure, scalable API key management for developers
Stars
5,458Last commit
5 hours agoLicense
AGPL-3.0
Streamline API authentication with UnKey's powerful, developer-friendly platform for creating, revoking, and monitoring API keys.
Open Source Alternative to:
Distributed OLAP database for real-time analytics at scale
Stars
6,149Last commit
8 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:
Free, cross-platform video editor that's easy to learn
Stars
6,601Last commit
9 hours 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:
Build scalable authorization in minutes, not months
Stars
5,961Last commit
8 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:
Clean your system and free disk space
Stars
7,054Last commit
2 days 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:
Complete office suite for documents, spreadsheets & more
Stars
6,973Last commit
3 months 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:
Secure, encrypted notes for your digital life
Stars
6,645Last commit
7 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:
Lightweight self-hosted bookkeeping with AI receipt scanning
Stars
5,719Last commit
23 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:
Continuous web-based localization for global reach
Stars
6,107Last commit
5 hours agoLicense
GPL-3.0
Web-based continuous localization platform with version control integration, quality checks, and clean interface. Used by 2,500+ projects in 165+ countries.
Open Source Alternative to:
Organize, collaborate, and conquer your tasks
Stars
5,626Last commit
11 hours agoLicense
AGPL-3.0
A powerful, open-source task management platform for teams and individuals, offering customizable workflows and seamless integration.
Open Source Alternative to:
Privacy-focused analytics without the complexity
Stars
8,021Last commit
7 months agoLicense
MIT
A simple, privacy-first analytics platform that provides valuable website insights without compromising visitor data or requiring cookie consent banners.
Open Source Alternative to:
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Capture – Capture screenshots, generate PDFs, scrape content, extract metadata, and automate browsers with one API.
Capture
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