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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Unified API, event, and AI agent management platform
Stars
461Last commit
6 hours agoLicense
Apache-2.0
Full-lifecycle API management platform that unifies synchronous and asynchronous ecosystems. Manage APIs, event streams, and AI agents with enterprise security and 4x faster gateway performance.
Open Source Alternative to:
Self-hosted AI coding agent that opens real PRs
Stars
Stars growing quickly over the last 30 days307Last commit
10 hours agoLicense
FCL-1.0
Source-available, self-hosted AI coding agent that connects to your repo, tools, and chat to investigate issues and open reviewable PRs on your own infrastructure.
Open Source Alternative to:
Fast, secure, and privacy-focused web browsing
Stars
409Last commit
15 hours agoLicense
MPL-2.0
Midori Browser is a lightweight, fast, and secure browser that protects users' privacy, available for Windows, Linux, and Android.
Open Source Alternative to:
Open-source ideation tool for product feedback management
Stars
450Last commit
14 days agoLicense
Apache-2.0
ClearFlask is an open-source platform for collecting, analyzing, and acting on customer feedback to drive product development.
Open Source Alternative to:
Track coding time across 70+ editors, completely free
Stars
Stars growing over the last 30 days216Last commit
5 hours agoLicense
MIT
Free, open-source coding time tracker compatible with VS Code, JetBrains IDEs, vim, emacs and more. No limits, no paywalls - your data stays yours forever.
Open Source Alternative to:
Track your brand's visibility across AI answer engines
Stars
Stars growing quickly over the last 30 days270Last commit
9 days agoLicense
AGPL-3.0
GEO tool that queries ChatGPT, Claude, Gemini, and Perplexity with your buyers' questions, then shows you who gets recommended and how to close the gap.
Open Source Alternative to:
Professional link management for modern teams
Stars
343Last commit
1 month agoLicense
AGPL-3.0
Open-source platform for creating shortened URLs with advanced analytics, custom domains, and API integration for marketing and development teams.
Open Source Alternative to:
Anonymous publishing with no accounts, tracking, or logins
Stars
321Last commit
8 hours agoLicense
Unlicense
Self-hosted platform for publishing text anonymously. Write, get a link, share it. No accounts, no tracking, no edits after posting.
Open Source Alternative to:
Low-code and no-code platform for business apps
Stars
387Last commit
23 hours agoLicense
AGPL-3.0
Full-stack open source platform combining no-code and low-code studios to build, deploy, and integrate web, mobile, and desktop business applications.
Open Source Alternative to:
Create stunning forms with AI-powered builder and analytics
Stars
355Last commit
6 months agoLicense
MIT
Build beautiful, interactive forms with AI assistance. Open-source alternative to Google Forms with unlimited submissions, advanced analytics, and seamless integrations.
Open Source Alternative to:
Community-driven platform built for transparency
Stars
400Last commit
5 days agoLicense
AGPL-3.0
Open-source communication platform with multi-window chat, economy systems, and privacy-first approach. Built by communities for superior performance.
Open Source Alternative to:
Experiment tracking platform for ML teams
Stars
394Last commit
8 months agoLicense
Apache-2.0
Open source ML experiment tracking platform with parameter and gradient logging, media tracking, real-time alerts, and full Weights & Biases API compatibility.
Open Source Alternative to:
Deploy web apps with automated CI/CD and full infrastructure control
Stars
264Last commit
5 hours agoLicense
GPL-3.0
Self-hosted platform for web applications offering automated CI/CD pipelines, multiple environments, and Git integration - with 47% infrastructure cost savings.
Open Source Alternative to:
Build lasting communities with modern forum technology
Stars
342Last commit
4 days agoLicense
MPL-2.0
Create permanent, discoverable communities with modern forum features. Combines discussion, curation, and wiki functionality in one platform.
Open Source Alternative to:
Seamless data import for your applications
Stars
294Last commit
2 months agoLicense
MIT
Open-source solution for effortless data importing, mapping, and validation in web applications
Decentralized CAPTCHA for enhanced web security
Stars
305Last commit
4 hours agoLicense
Apache-2.0
A blockchain-based CAPTCHA solution offering improved security, user experience, and resistance to bot attacks for web applications.
Open Source Alternative to:
OTA updates for Capacitor apps without app store delays
Stars
211Last commit
5 hours agoLicense
AGPL-3.0
Live update platform for Ionic and Capacitor apps that pushes JavaScript, CSS, and asset changes to devices in minutes, with channels, rollback, and release analytics.
Open Source Alternative to:
Distraction-free note-taking with powerful features
Stars
319Last commit
9 days agoLicense
AGPL-3.0
A customizable, offline-first note editor that lets you format text, create lists, add images, and export to HTML - all while maintaining your privacy.
Open Source Alternative to:
Connect APIs, databases, and streams without glue code
Stars
360Last commit
4 months agoLicense
Unknown
Automated data integration platform that connects APIs, databases, and event streams using semantic schemas. Deploy secure integrations in minutes with Git-based workflows.
Open Source Alternative to:
Track and improve your brand's visibility in AI search
Stars
Stars growing quickly over the last 30 days161Last commit
15 hours agoLicense
MIT
Monitors how your brand appears across ChatGPT, Perplexity, Google AI Overviews, and other AI platforms, then turns those insights into prioritized content and optimization actions.
Open Source Alternative to:
Track coding time and boost developer productivity
Stars
257Last commit
1 day agoLicense
AGPL-3.0
Monitor your coding sessions, analyze productivity patterns, and gain insights into your development workflow with comprehensive time tracking statistics.
Open Source Alternative to:
Organize, discover, and personalize your bookmarks
Stars
325Last commit
6 months agoLicense
AGPL-3.0
Open-source bookmark manager with timeline view, one-click saving, categorization, and sharing features. Free plan available with pro upgrades.
Open Source Alternative to:
Bring your own cloud storage, managed in one place
Stars
370Last commit
1 year agoLicense
AGPL-3.0
Firefiles turns S3 buckets and other cloud backends into a unified file manager with browser-based previews, multi-drive support, and a clean light/dark interface.
Open Source Alternative to:
Effortless changelog creation for open-source projects
Stars
284Last commit
2 months agoLicense
AGPL-3.0
Automate and simplify changelog generation from Git commits, ensuring clear and consistent project documentation.
Open Source Alternative to:
Open-source changelog & roadmap platform for teams
Stars
301Last commit
8 months agoLicense
Apache-2.0
Self-hostable changelog and roadmap platform with community voting, automated newsletters, and kanban boards. Deploy with Docker in minutes.
Open Source Alternative to:
Track your brand's presence in AI-generated answers
Stars
Stars growing quickly over the last 30 days231Last commit
20 days agoLicense
MIT
Runs prompts through ChatGPT, Perplexity, Gemini, Claude, and Google AI Overview interfaces via browser automation, then analyzes captured responses and citations with a model endpoint you configure.
Open Source Alternative to:
Track and improve your brand's visibility in AI answers
Stars
Stars growing quickly over the last 30 days193Last commit
15 hours agoLicense
MIT
Tracks how often AI tools like ChatGPT, Claude, and Perplexity mention or cite your brand, then fixes the gaps through AEO strategy and content work.
Open Source Alternative to:
Transform idle cash into competitive yield for startups
Stars
255Last commit
7 months agoLicense
MIT
High-yield treasury management for startups earning 8% APY with insurance coverage up to $1M. Open US/EU accounts instantly with full liquidity and no minimums.
Effortless blogging for developers and tech enthusiasts
Stars
254Last commit
2 months agoLicense
AGPL-3.0
A minimalist, markdown-based blogging platform designed for developers, featuring syntax highlighting and seamless Git integration.
Open Source Alternative to:
Personal blogging platform that meets you where you write
Stars
194Last commit
5 hours agoLicense
MIT
Publish blog posts by email, from Obsidian, iA Writer, the web editor, CLI, or API. Includes RSS, email subscribers, analytics, custom domains, and full export.
Open Source Alternative to:
Cut billing costs with open-source subscription management
Stars
233Last commit
8 months agoLicense
AGPL-3.0
Replace expensive billing solutions with open-source software. Automate subscriptions, accept multiple payments including crypto, and gain real-time revenue insights.
Open Source Alternative to:
GDPR-compliant bot protection without user friction
Stars
198Last commit
5 hours agoLicense
Unknown
Privacy-first CAPTCHA service that blocks bots while keeping forms accessible. No puzzles, no tracking, no cookies - just invisible cryptographic protection.
Open Source Alternative to:
Privacy-first, cookieless analytics without consent banners
Stars
180Last commit
15 hours agoLicense
AGPL-3.0
GDPR-compliant web analytics with real-time insights, session replay, and funnel tracking. No cookies, no tracking, no consent banners required.
Open Source Alternative to:
Generate legal policies directly from TypeScript code
Stars
165Last commit
5 days agoLicense
Apache-2.0
Open-source policy-as-code framework that lets developers create privacy policies, terms of service, and legal agreements using TypeScript with built-in GDPR/CCPA compliance.
Open Source Alternative to:
Scale document creation with automated workflows
Stars
167Last commit
21 days agoLicense
AGPL-3.0
Complete document lifecycle management with automated generation, approval workflows, e-signatures, and branded templates. Create professional documents at scale.
Open Source Alternative to:
Error tracking, performance, and uptime in one place
Stars
Stars growing over the last 30 days170Last commit
5 days agoLicense
MIT
Self-hostable error tracking platform compatible with Sentry SDKs. Tracks exceptions, monitors performance, checks uptime, and collects logs without the Sentry price tag.
Open Source Alternative to:
Secure open source messaging for professional teams
Stars
Stars growing over the last 30 days171Last commit
5 hours agoLicense
AGPL-3.0
Free Matrix-based messenger with end-to-end encryption, multi-platform bridges, and on-premise deployment. Connect across 30+ networks securely.
Open Source Alternative to:
Effortlessly manage tasks, projects, and teams
Stars
247Last commit
1 year agoLicense
AGPL-3.0
A versatile project management platform that combines task organization, team collaboration, and workflow automation in one intuitive interface.
Open Source Alternative to:
Fast, secure, and free personal note-taking app
Stars
179Last commit
3 months agoLicense
Unknown
OpenNotas is a multi-platform, end-to-end encrypted note-taking app that offers simplicity, synchronization, and offline functionality.
Open Source Alternative to:
Transcribe meetings and voice notes with local AI, no bots required
Stars
122Last commit
20 days agoLicense
MIT
Free, open-source AI note-taker that transcribes meetings and voice notes locally using Whisper and Parakeet. Works on Mac, Windows, and mobile without invasive bots.
Open Source Alternative to:
Secure, scalable chat server for modern applications
Stars
161Last commit
19 days agoLicense
GPL-3.0
Open source chat server with end-to-end encryption, clustering support, and comprehensive messaging features for building real-time communication apps
Open Source Alternative to:
Create and manage forms with ease
Stars
184Last commit
1 year agoLicense
Apache-2.0
Formizee is an open-source platform for designing, building, and analyzing forms, offering an affordable all-in-one solution
Open Source Alternative to:
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