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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Build and play games inside a game engine that runs live
Stars
6,533Last commit
6 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:
Simple yet powerful CI/CD engine with great extensibility
Stars
8,190Last commit
9 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:
Secure, customizable e-signatures for modern businesses
Stars
7,256Last commit
10 hours agoLicense
AGPL-3.0
A powerful, open-source e-signature solution offering customization, integration, and enhanced security for businesses of all sizes.
Open Source Alternative to:
Full-stack observability without code changes
Stars
8,018Last commit
1 day agoLicense
Apache-2.0
Coroot simplifies system monitoring by providing metrics, logs, traces, and profiling with zero instrumentation, leveraging eBPF technology.
Open Source Alternative to:
Comprehensive monitoring and incident management platform
Stars
7,819Last commit
5 hours agoLicense
Apache-2.0
All-in-one solution for uptime monitoring, incident management, and status pages to keep your services running smoothly
Open Source Alternative to:
Simplify expense management for businesses of all sizes
Stars
5,094Last commit
6 hours agoLicense
MIT
Automate expense reporting, reimbursements, and corporate card management with real-time data sync and powerful integrations.
Modular auth, payments, emails, and analytics for your product
Stars
6,892Last commit
7 hours agoLicense
Unknown
Self-hostable platform combining user auth, payments, email, and analytics into modular building blocks that fit around your existing product.
Open Source Alternative to:
Dashboard for running multiple coding agents in parallel
Stars
Stars growing over the last 30 days6,244Last commit
4 days 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:
An agentic IDE that can control and automate itself
Stars
Stars growing quickly over the last 30 days5,522Last commit
6 hours agoLicense
MIT
Local-first IDE that runs multiple AI coding agents in parallel, supports plugins built in a single prompt, and lets any script or bot spawn work threads.
Open Source Alternative to:
Visual app builder that integrates with your existing codebase
Stars
7,164Last commit
11 hours agoLicense
MIT
Open-source visual editor for building websites and web apps. Connect to any data source, design custom UIs, and ship production React code without leaving your stack.
Open Source Alternative to:
Pixel art, vectors, animation, and photo editing in one
Stars
8,139Last commit
12 hours agoLicense
LGPL-3.0
Desktop 2D graphics editor combining pixel art tools, vector drawing, frame-by-frame animation, and a node graph workflow for procedural, non-destructive editing.
Open Source Alternative to:
Desktop SQL client with built-in MCP for AI agent access
Stars
Stars growing over the last 30 days5,466Last commit
9 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:
Build stateful backends with in-memory actors
Stars
Stars growing over the last 30 days6,906Last commit
2 days 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:
Unify vector search and graph traversals in one database
Stars
6,287Last commit
7 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:
Effortless API mocking for seamless development
Stars
8,484Last commit
9 hours agoLicense
MIT
Create, run, and share mock REST APIs without coding. Boost productivity with an intuitive interface and powerful features.
Open Source Alternative to:
Open-source serverless CMS for modern web projects
Stars
8,052Last commit
10 hours agoLicense
MIT
A powerful, scalable platform for building custom websites and apps with serverless architecture, offering flexibility and cost-efficiency.
Open Source Alternative to:
Open-source cloud communications platform for developers
Stars
8,165Last commit
11 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:
Unified observability database for metrics, logs, and traces
Stars
6,811Last 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:
Self-hosted file sharing built for digital sovereignty
Stars
6,332Last commit
5 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:
Auto-generated network diagrams that stay current
Stars
5,958Last commit
24 hours 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:
The tensor database for AI data
Stars
9,267Last commit
6 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:
Secure email, calendar and contacts with end-to-end encryption
Stars
8,157Last commit
7 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
6,938Last commit
11 days 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:
Open-source legal AI that law firms control and extend
Stars
Stars growing over the last 30 days4,474Last commit
19 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:
Secure collaboration with end-to-end encryption
Stars
8,076Last commit
1 day 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:
Browser-based IMAP webmail with a full email client feel
Stars
7,277Last commit
2 days agoLicense
GPL-3.0
PHP-based webmail client with MIME support, address book, folder management, threaded views, PGP encryption, and a plugin API for self-hosted email.
Open Source Alternative to:
Build reliable AI apps with comprehensive observability
Stars
6,280Last commit
2 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:
Transform SQL into beautiful data stories
Stars
7,116Last commit
6 hours agoLicense
MIT
Create data-driven websites and reports using SQL and Markdown, with automatic visualizations and interactive elements.
Open Source Alternative to:
Run 60+ AWS services locally, free forever
Stars
Stars growing over the last 30 days5,152Last commit
10 hours agoLicense
MIT
MIT-licensed AWS emulator running 60+ services in a single Docker container. Drop-in replacement for LocalStack with real Postgres, Redis, and Docker containers.
Open Source Alternative to:
Ad-free photo sharing with privacy and federation
Stars
7,144Last commit
1 day 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:
Launch Your Store in Minutes, No Code Needed
Stars
5,538Last commit
1 day agoLicense
MIT
Fast, modern e-commerce with instant setup and full customization. Powered by Stripe for seamless transactions.
Open Source Alternative to:
Organize and secure your documents in one central hub
Stars
Stars growing over the last 30 days5,744Last commit
23 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:
Flexible project management you can host yourself
Stars
6,079Last commit
24 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:
Programmable notes with queries, Lua scripting, and wiki links
Stars
Stars growing over the last 30 days6,524Last commit
11 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:
Create privacy-first static websites with ease
Stars
7,403Last commit
6 days agoLicense
GPL-3.0
Desktop CMS for building fast, secure static websites with zero technical complexity. GDPR & CCPA compliant with one-click deployment.
Open Source Alternative to:
Complete office suite for documents, spreadsheets & more
Stars
7,126Last commit
13 hours 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:
Feature flags and remote config for rapid deployment
Stars
Stars growing over the last 30 days7,214Last commit
5 hours agoLicense
BSD-3-Clause
Powerful feature management platform for seamless software releases, A/B testing, and personalized user experiences.
Open Source Alternative to:
Time-series database built for industrial IoT workloads
Stars
6,436Last commit
10 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:
Sync and transform data from any source to any destination
Stars
6,558Last commit
9 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
5,402Last commit
5 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
Stars growing over the last 30 days5,977Last commit
8 hours 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:
Virtual office platform for engaging remote collaboration
Stars
5,931Last commit
6 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:
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Openlane – Open-source, developer-first platform for automated compliance, risk management, and built-in Trust Center.
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