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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API management platform for developers and AI agents
Stars
2,126Last commit
8 days agoLicense
Apache-2.0
Open source API management platform that exposes databases as REST, routes microservice traffic, handles billing, and generates SDKs across multiple languages.
Open Source Alternative to:
Privacy-first analytics for mobile and desktop apps
Stars
1,842Last commit
2 days agoLicense
AGPL-3.0
Open-source, self-hostable analytics platform for mobile and desktop apps, prioritizing user privacy and data control.
Open Source Alternative to:
Transform any song into karaoke with AI-powered vocals
Stars
1,498Last commit
1 day agoLicense
GPL-3.0
AI-powered karaoke software that separates vocals from any song, transcribes lyrics with word-level sync, scores your pitch in real-time, and includes dynamic backgrounds.
Open Source Alternative to:
Managed identity and access management for any app
Stars
2,108Last commit
15 hours agoLicense
Apache-2.0
Authgear is a managed IAM platform handling authentication, SSO, and user management for B2C and B2B apps, with biometrics, MFA, and zero-trust support.
Open Source Alternative to:
AI code review that learns your team's standards
Stars
1,481Last commit
10 hours agoLicense
AGPL-3.0
Open source AI code reviewer that analyzes pull requests for quality, security, and performance while respecting your existing rules and model preferences.
Open Source Alternative to:
Chat with private and local large language models
Stars
2,269Last commit
1 year agoLicense
MIT
A mobile app for interacting with private, local large language models that work offline and are optimized for Apple silicon.
Open Source Alternative to:
Simplify container deployment across environments
Stars
1,847Last commit
2 days agoLicense
Apache-2.0
Effortless container orchestration platform for seamless deployment, management, and monitoring of applications across multiple environments.
Open Source Alternative to:
Complete infrastructure monitoring with 25+ years of expertise
Stars
2,051Last commit
2 months agoLicense
GPL-2.0
Free open source IT monitoring solution for servers, networks, and applications. Trusted by 1M+ users worldwide with powerful alerting and enterprise-grade features.
Open Source Alternative to:
Self-hosted password vault built for teams and compliance
Stars
1,832Last commit
3 days agoLicense
GPL-3.0
Collaborative password manager with folder-level access control, AES-256-GCM encryption, governance tools, and Linux password rotation, runs on your own servers.
Open Source Alternative to:
Parallel AI agent workspaces with Git and project context
Stars
1,328Last commit
16 hours agoLicense
Apache-2.0
Run multiple AI coding agents in isolated Git worktrees, with cross-repo context, GitHub/Linear integrations, and support for Claude, Codex, Cursor, and more.
Open Source Alternative to:
Cross-system automation and knowledge base for accounting firms
Stars
1,722Last commit
5 months agoLicense
Unknown
Connects client data across tools, automates recurring accounting workflows, and maintains a self-updating knowledge base with human approval controls.
Privacy-first proof-of-work CAPTCHA without user friction
Stars
2,491Last commit
1 year agoLicense
AGPL-3.0
Privacy-focused proof-of-work CAPTCHA system that silently protects websites without tracking users or requiring image solving. Drop-in replacement for reCAPTCHA.
Open Source Alternative to:
Secure collaboration platform with end-to-end encryption
Stars
2,554Last commit
9 months agoLicense
GPL-3.0
A comprehensive collaboration platform offering end-to-end encrypted messaging, file sharing, and video calls with enterprise-grade security and compliance features.
Open Source Alternative to:
Effortlessly split expenses with friends and groups
Stars
1,469Last commit
18 hours agoLicense
MIT
Free, open-source expense sharing app with multi-currency support, unequal splits, and receipt uploads. Import from Splitwise and enjoy PWA functionality.
Open Source Alternative to:
AI-powered PostgreSQL management made simple
Stars
1,452Last commit
6 hours agoLicense
AGPL-3.0
Modern PostgreSQL database management with AI-powered filtering, natural language queries, and cloud sync. Focus on your data while AI handles complexity.
Open Source Alternative to:
The modern GraphQL runtime
Stars
1,443Last commit
2 months agoLicense
Apache-2.0
Swiftly design and ship best-practice GraphQL backends atop existing data sources and APIs.
Open Source Alternative to:
Local-first, offline-first no-code database platform
Stars
2,978Last commit
23 days agoLicense
AGPL-3.0
Build and manage custom databases with ease, create type-safe APIs, and develop applications quickly
Open Source Alternative to:
Unlock Data's Potential with Open Source Power
Stars
1,429Last commit
10 hours agoLicense
Apache-2.0
Leverage advanced analytics with a modern PostgreSQL kernel. 100% open source for robust data solutions.
Open Source Alternative to:
Privacy-first analytics without cookies or tracking
Stars
1,202Last commit
23 hours agoLicense
AGPL-3.0
Get powerful web analytics with zero cookies, 100% GDPR compliance, and full data ownership. Lightweight 3KB script delivers real-time insights without compromising user privacy.
Open Source Alternative to:
Secure self-hosted cloud storage with end-to-end encryption
Stars
1,527Last commit
6 hours agoLicense
Unknown
Lightweight, self-hosted cloud storage built with Rust and Vue.js. Features end-to-end encryption, file sharing, search capabilities, and Docker deployment.
Open Source Alternative to:
All-in-one observability with unlimited data ingestion
Stars
1,712Last commit
17 hours agoLicense
AGPL-3.0
Unified platform for logs, metrics, traces and profiles with native compatibility for popular tools like OpenTelemetry, Prometheus, and Loki. No data silos, no usage limits.
Open Source Alternative to:
Local-first 2FA authenticator and password manager
Stars
1,537Last commit
9 days agoLicense
GPL-3.0
Open-source authenticator and password manager that stores 2FA tokens and passwords locally on your device, with zero-knowledge encryption and no account required.
Open Source Alternative to:
Open-source knowledge management and collaboration platform
Stars
1,319Last commit
7 hours agoLicense
LGPL-2.1
XWiki is a flexible, feature-rich wiki software that helps organizations structure and share knowledge efficiently.
Open Source Alternative to:
Self-hosted SERP API for Google, Bing, Yandex, and more
Stars
1,475Last commit
17 days agoLicense
MIT
Query Google, Bing, Yandex, Baidu, DuckDuckGo, and Ecosia through one REST API. Self-host free under MIT, or use the managed cloud option.
Open Source Alternative to:
AI chat companion with versatile model support
Stars
1,532Last commit
10 months agoLicense
Apache-2.0
Open-source chat application that lets you interact with multiple AI models in one interface, offering flexible conversations and diverse capabilities.
Open Source Alternative to:
Cookie-less analytics for privacy-focused insights
Stars
1,743Last commit
11 months agoLicense
Apache-2.0
Track user behavior, custom events, and conversion funnels in real-time with a single line of code, all while maintaining GDPR compliance.
Open Source Alternative to:
Cloud-native framework for infrastructure from code
Stars
2,017Last commit
8 months agoLicense
Apache-2.0
Nitric automates cloud infrastructure provisioning from your application code for AWS, GCP and Azure
Open Source Alternative to:
AI agent workflows built natively into GitHub
Stars
1,311Last commit
2 days agoLicense
MIT
An open-source GitHub bot that runs AI agents to review PRs, triage issues, fix CI failures, and ship code using any LLM provider.
Open Source Alternative to:
Open-source testing agent for UI, API, security, accessibility & visual QA
Stars
1,187Last commit
1 day agoLicense
AGPL-3.0
Hercules is the first open-source testing agent, enabling zero-code, zero-maintenance UI, API, security, accessibility, and visual validations.
Open Source Alternative to:
Powerful open-source business intelligence for data-driven decisions
Stars
1,026Last commit
1 day agoLicense
AGPL-3.0
Connect multiple data sources, build complex queries, create insightful visualizations, and organize powerful dashboards to make informed business decisions.
Open Source Alternative to:
Unify APIs, databases, and services effortlessly
Stars
1,276Last commit
6 hours agoLicense
Apache-2.0
A powerful backend framework that simplifies API integration, enhances security, and boosts developer productivity for modern web applications.
Open Source Alternative to:
GitOps orchestration for infrastructure as code
Stars
1,299Last commit
22 hours agoLicense
MPL-2.0
Automate infrastructure changes with secure GitOps workflows. Plan, validate, and deploy Terraform, OpenTofu, and Pulumi directly from pull requests.
Open Source Alternative to:
Fast, scalable analytics infrastructure
Stars
1,663Last commit
6 months agoLicense
MIT
Open source analytics platform built on ClickHouse and Kafka, offering high-speed event tracking and real-time querying capabilities.
Open Source Alternative to:
Transform team email into efficient collaborative workflows
Stars
1,759Last commit
8 months agoLicense
AGPL-3.0
Streamline team communication with shared inboxes, unlimited email addresses, and customizable workflows. Perfect for modern businesses seeking organized email management.
Open Source Alternative to:
Lightroom-compatible RAW editor, no subscription
Stars
1,187Last commit
5 hours agoLicense
MIT
Non-destructive RAW photo editor for macOS, Linux, and Windows that reads Lightroom catalogs, presets, and camera profiles. Free, MIT licensed, built in Rust.
Open Source Alternative to:
Self-hosted AI agents and workflows across any channel
Stars
1,151Last commit
22 days agoLicense
AGPL-3.0
Build and run AI agents, agentic workflows, and multichannel automation on your own infrastructure, with memory, RAG, MCP tools, and full data control.
Open Source Alternative to:
Transform your source code into stunning visuals
Stars
1,846Last commit
9 months agoLicense
MIT
Create beautiful, customizable images of your source code with ease, perfect for presentations, documentation, and social media sharing.
Open-source webhooks for seamless integrations
Stars
1,495Last commit
15 hours agoLicense
SSPL-1.0
Self-hosted webhook solution for effortless event-driven communication between applications, enhancing system interoperability and automation.
Open Source Alternative to:
Flexible billing infrastructure for modern SaaS
Stars
1,330Last commit
6 days agoLicense
AGPL-3.0
Open-source pricing and billing platform that helps SaaS companies launch, test, and scale complex billing models with ease. Features metering, invoicing, and real-time data.
Open Source Alternative to:
Handcrafted minimal bookmark manager with advanced tagging system
Stars
1,328Last commit
2 months agoLicense
MIT
A private, open-source bookmark manager for power users and large libraries, with a powerful, clutter-free UI.
Open Source Alternative to:
Local-first notes app with no cloud, no AI, no tracking
Stars
1,347Last commit
13 days agoLicense
MIT
A privacy-focused, offline-first note-taking app that stores everything on your device, with Markdown, note linking, file attachments, LaTeX math, and bring-your-own sync.
Open Source Alternative to:
Firefox fork hardened for privacy, security, and freedom
Stars
1,340Last commit
13 hours agoLicense
Unknown
A Firefox-based browser that strips telemetry, blocks trackers, disables DRM, and ships with a content blocker out of the box.
Open Source Alternative to:
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Tools that analyze website performance, optimize content visibility, track rankings, and improve search engine results.
AI Coding Agent Orchestrators
Tools that run and coordinate multiple AI coding agents in parallel across isolated git worktrees, also known as agent harnesses or agentic dev environments.
CRM Systems
Customer relationship management systems for tracking contacts, deals, and pipelines, with activity history and sales reporting.
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Platforms for managing recurring subscriptions and complex billing models.
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Enterprise Resource Planning systems integrating various business functions.
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Stellar Hosted