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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Turn any website into clean, AI-ready data via API
Stars
Stars growing over the last 30 days194,767Last commit
10 hours agoLicense
AGPL-3.0
API for AI agents to search, scrape, crawl, and interact with the live web, returning clean Markdown, structured JSON, or screenshots from any page.
Open Source Alternative to:
Schedule, analyze, and manage 30+ social media accounts
Stars
Stars growing over the last 30 days37,688Last commit
13 hours agoLicense
AGPL-3.0
Self-hostable social media scheduler that lets you plan, generate, and publish content across 30+ networks with AI assistance, team collaboration, and automation integrations.
Open Source Alternative to:
Multi-channel notification infrastructure for apps
Stars
40,195Last commit
4 hours agoLicense
Unknown
Open-source platform for building in-app, email, push, SMS, and chat notifications with a unified API, workflow engine, and embeddable inbox component.
Open Source Alternative to:
Self-hosted SEO platform for keyword, backlink, and rank tracking
Stars
Stars growing quickly over the last 30 days24,721Last commit
1 day agoLicense
MIT
Manage keyword research, backlink analysis, competitor monitoring, and rank tracking without expensive SaaS subscriptions. Self-hostable, MIT-licensed, uses DataForSEO.
Open Source Alternative to:
A clean, cross-platform SQL editor for multiple databases
Stars
23,788Last commit
13 hours agoLicense
Unknown
SQL GUI client for MySQL, Postgres, SQLite, SQL Server, and more, with a spreadsheet-like data editor, AI shell, SSH tunneling, and team workspaces.
Open Source Alternative to:
Structured control layer for customer-facing AI agents
Stars
18,308Last commit
21 hours agoLicense
Apache-2.0
A conversational AI server that manages agent behavior through context-aware guidelines, keeping responses consistent, auditable, and aligned at scale.
Open Source Alternative to:
An agentic CRM that keeps records current automatically
Stars
Stars growing over the last 30 days11,632Last commit
15 hours agoLicense
MIT
Open source CRM with AI agents that read your inbox, enrich contacts and companies, schedule follow-ups, and build new agents from plain-language descriptions.
Open Source Alternative to:
Passkeys, SSO, and MFA without vendor lock-in
Stars
9,045Last commit
11 hours agoLicense
AGPL-3.0
Open source authentication platform supporting passkeys, 2FA, SSO, and social login. Self-host or use Hanko Cloud, with full control over your data and no lock-in.
Open Source Alternative to:
Local voice dictation with AI enhancement for macOS
Stars
Stars growing over the last 30 days6,907Last commit
3 hours agoLicense
GPL-3.0
Privacy-first dictation app for Apple Silicon Macs that transcribes speech locally, cleans up output with AI, and auto-switches settings per app.
Open Source Alternative to:
Cookie-free web and product analytics, self-hostable
Stars
7,187Last commit
14 hours agoLicense
AGPL-3.0
Open-source analytics platform covering web traffic, custom events, funnels, retention, session replay, and revenue tracking. GDPR-compliant with optional self-hosting.
Open Source Alternative to:
Task management with GitHub sync and AI agents for devs
Stars
Stars growing quickly over the last 30 days4,888Last commit
3 hours agoLicense
AGPL-3.0
Task manager built for engineering teams, combining status tracking, priority management, GitHub integration, and AI agents that can close tasks automatically.
Open Source Alternative to:
Team chat with email, tasks, and docs in one workspace
Stars
Stars growing quickly over the last 30 days4,888Last commit
3 hours agoLicense
AGPL-3.0
Team chat app with inline threads, mention-based sharing, a unified inbox for chat and email, and an AI agent that works across your full workspace.
Open Source Alternative to:
Keyboard-first email client with AI, chat, and tasks
Stars
Stars growing quickly over the last 30 days4,888Last commit
3 hours agoLicense
AGPL-3.0
An AI-powered email client that combines inbox management, chat, tasks, and AI agents in one shared workspace, built for keyboard-driven workflows.
Open Source Alternative to:
Markdown docs wired into tasks, email, and agents
Stars
Stars growing quickly over the last 30 days4,888Last commit
3 hours agoLicense
AGPL-3.0
Collaborative markdown documents with real-time CRDT editing, AI agent cursors, mention linking, and built-in properties tied to your tasks, channels, and email.
Open Source Alternative to:
A self-building CRM powered by your email
Stars
Stars growing quickly over the last 30 days4,888Last commit
3 hours agoLicense
AGPL-3.0
Automatically creates and enriches contacts, companies, and deal threads from your team's email. No data entry, no imports, no admin overhead.
Open Source Alternative to:
No-code database and app builder you can self-host
Stars
Stars growing over the last 30 days6,206Last commit
3 hours agoLicense
MIT
Open-source platform for building databases, internal apps, and automated workflows without writing code. Available on cloud or self-hosted.
Open Source Alternative to:
Private AI chat with zero-access encryption
Stars
5,649Last commit
14 hours agoLicense
GPL-3.0
AI chat assistant from Proton that stores conversations with zero-access encryption, never logs chats, and never uses your data to train models.
Open Source Alternative to:
Open-source localization platform for multilingual apps
Stars
4,139Last commit
19 hours agoLicense
Apache-2.0
Manage app translations with in-context editing, AI translation, and collaborative tools. Self-hostable and free to start.
Open Source Alternative to:
Managed compliance for SOC 2, ISO 27001, HIPAA, and more
Stars
Stars growing over the last 30 days1,476Last commit
18 hours agoLicense
MIT
Compliance management platform where dedicated compliance officers handle your entire program, from risk assessments to audit coordination, with automated evidence collection.
Open Source Alternative to:
AWS-compatible cloud APIs on infrastructure you control
Stars
Stars growing quickly over the last 30 days393Last commit
11 hours agoLicense
AGPL-3.0
Spinifex recreates EC2, S3, EBS, VPC, IAM, and more on your own hardware, so AWS-built software runs unchanged without touching a hyperscaler.
Open Source Alternative to:
Continuous compliance automation for SOC 2, ISO 27001 & more
Stars
Stars growing over the last 30 days334Last commit
8 hours agoLicense
Apache-2.0
Automates evidence collection, control tracking, and audit reporting across SOC 2, ISO 27001, NIST 800-53, GDPR, and 12+ other frameworks in one platform.
Open Source Alternative to:
An AI assistant that acts, not just answers
Stars
392,910Last commit
3 hours agoLicense
MIT
A personal AI assistant that connects to your existing chat apps and handles real tasks like email, calendar, and flight check-ins on your behalf.
Open Source Alternative to:
Desktop AI agent with persistent memory across platforms
Stars
Stars growing over the last 30 days256,609Last commit
3 hours agoLicense
MIT
Cross-platform desktop agent from Nous Research that connects to Telegram, Discord, Slack, WhatsApp, and more, with persistent memory, scheduling, and isolated sandboxing.
Open Source Alternative to:
AI coding agent for terminal, IDE, and desktop
Stars
Stars growing over the last 30 days220,847Last commit
4 hours agoLicense
MIT
Open source AI coding agent that works in your terminal, IDE, or desktop app, supporting 75+ LLM providers with no code storage.
Open Source Alternative to:
Visual workflow automation with code flexibility and AI agents
Stars
208,445Last commit
3 hours agoLicense
Unknown
Build automated workflows connecting 500+ apps, write custom code, and deploy AI agents with full visibility into every decision. Self-hostable or cloud.
Open Source Alternative to:
Build and run AI agents that handle recurring work for you
Stars
187,724Last commit
3 hours agoLicense
Other
Platform for building, deploying, and running AI agents that automate repeatable digital work across research, outreach, content, and support without writing code.
Open Source Alternative to:
Run open-source LLMs locally on your own machine
Stars
184,589Last commit
11 hours agoLicense
MIT
Runs open-source language models locally with a simple setup, plus optional cloud access for larger models when local hardware isn't enough.
Open Source Alternative to:
Build and deploy AI agents and RAG pipelines visually
Stars
159,398Last commit
4 hours agoLicense
Unknown
Visual platform for building agentic workflows, RAG pipelines, and LLM-powered apps. Supports hundreds of models, MCP integration, and self-hosted deployment.
Open Source Alternative to:
One interface for every AI model you run or connect
Stars
156,612Last commit
5 hours agoLicense
BSD-3-Clause
Self-hosted AI platform that connects local and cloud models, extends with Python, and keeps your data under your control.
Open Source Alternative to:
AI coding agent that works inside your terminal
Stars
130,731Last commit
16 hours agoLicense
Apache-2.0
Terminal-based AI coding agent that inspects files, edits code, runs commands, and integrates into CI pipelines using OpenAI's Codex models.
Open Source Alternative to:
Visual builder for AI agents and RAG pipelines
Stars
155,975Last commit
5 hours agoLicense
MIT
Build, deploy, and iterate on AI agents, RAG applications, and MCP servers using a drag-and-drop visual interface backed by Python.
Open Source Alternative to:
Run LLMs locally with minimal setup, maximum hardware support
Stars
132,185Last commit
3 hours agoLicense
MIT
C/C++ inference engine for large language models, supporting quantization, multi-GPU, Apple Silicon, and an OpenAI-compatible server across a wide range of hardware.
Open Source Alternative to:
Org chart, budgets, and governance for AI agent teams
Stars
Stars growing quickly over the last 30 days106,692Last commit
3 hours agoLicense
MIT
Manages teams of AI agents across business functions with org charts, goal alignment, cost tracking, ticket tracing, and board-level governance controls.
Open Source Alternative to:
Minimal terminal coding agent you can fully customize
Stars
Stars growing over the last 30 days117,493Last commit
3 hours agoLicense
MIT
Terminal-based coding agent with a minimal core, 15+ LLM providers, tree-structured session history, and a TypeScript extension system for building your own workflows.
Open Source Alternative to:
Let AI agents control any browser, at scale
Stars
119,002Last commit
3 hours agoLicense
MIT
Python library that lets AI agents browse the web by giving them real browser control, DOM access, and the ability to interact with any website.
Open Source Alternative to:
Run multiple AI coding agents in parallel, side by side
Stars
Stars growing quickly over the last 30 days104,213Last commit
3 hours agoLicense
MIT
Agent Development Environment that runs Claude Code, Codex, Gemini, and other CLI agents in parallel across isolated git worktrees, with terminals, browser, diff review, and git tools built in.
Open Source Alternative to:
Collaborative whiteboard with a hand-drawn aesthetic
Stars
134,459Last commit
19 hours agoLicense
MIT
Virtual whiteboard for sketching diagrams, flowcharts, and wireframes with a distinctive hand-drawn look. Real-time collaboration built in.
Open Source Alternative to:
Self-hosted remote desktop you fully control
Stars
126,762Last commit
3 hours agoLicense
AGPL-3.0
Cross-platform remote desktop software that runs on your own servers, giving you full data control as a direct alternative to TeamViewer and AnyDesk.
Open Source Alternative to:
High-throughput, memory-efficient serving engine for LLMs
Stars
95,270Last commit
3 hours agoLicense
Apache-2.0
Inference and serving engine for large language models, built for speed and hardware efficiency with an OpenAI-compatible API and support for a wide range of open models.
Open Source Alternative to:
Self-hosted photo and video backup for your own server
Stars
117,047Last commit
3 hours agoLicense
AGPL-3.0
Back up, organize, search, and browse your personal photo and video library on your own server, with no third-party cloud access.
Open Source Alternative to:
Free 2D and 3D game engine for cross-platform projects
Stars
118,988Last commit
19 hours agoLicense
MIT
Build 2D, 3D, and XR games with a full-featured engine that includes its own scripting language, scene editor, and export tools for multiple platforms.
Open Source Alternative to:
Open source video editor that runs in your browser
Stars
Stars growing over the last 30 days95,950Last commit
1 month agoLicense
MIT
Browser-based, open source video editor built for privacy. No installs, no account required, works on any platform.
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.
Voice Dictation Tools
Applications that convert spoken words into text for faster writing across any application.
CRM Systems
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Enterprise Resource Planning systems integrating various business functions.
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Stellar Hosted – Managed Open Source software hosting in the EU: secure, compliant, fast.
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