Discover Free & Open Source Alternatives of Popular Software

The #1 collection of the best free & open source alternatives of popular software. Find the best hand-picked free & open source software.

Zero

An innovative open source email application that reimagines communication with built-in privacy features and modern user experience.

Alternative to:

Gmail

Privacy-first email for the modern age

Stars
9,546
Forks
1,162
Last commit
7 hours ago

Comp AI

Open source platform that automates SOC 2, ISO 27001, and GDPR compliance with real-time monitoring, AI-powered automation, and seamless tech stack integration.

Alternative to:

Vanta

Get SOC 2, ISO 27001 & GDPR Compliant in Weeks

Stars
1,029
Forks
157
Last commit
10 hours ago

Browser Use

Transform web interactions with AI agents that can understand and manipulate websites through visual and HTML element extraction.

AI-powered browser automation and control

Stars
69,082
Forks
8,037
Last commit
6 hours ago

GPT4All

A secure, offline AI chatbot that runs language models locally on your device, ensuring complete data privacy and unrestricted access without cloud dependencies.

Run powerful AI models privately on your own device

Stars
76,599
Forks
8,267
Last commit
3 months ago

Tailwind CSS

A utility-first CSS framework that lets you build custom designs directly in your HTML using composable utility classes, without writing custom CSS.

Alternative to:

Bootstrap

Modern CSS framework for rapid web development

Stars
89,908
Forks
4,712
Last commit
19 hours ago

Animate CSS

A comprehensive library of cross-browser CSS animations that adds smooth, polished motion effects to web elements with minimal effort.

Alternative to:

Bootstrap

Ready-to-use CSS animations for modern web design

Stars
82,116
Forks
16,159
Last commit
1 year ago

Private GPT

A production-ready AI framework that enables private, offline document analysis using LLMs - your data never leaves your environment.

Local LLM-powered document analysis without internet

Stars
56,541
Forks
7,573
Last commit
10 months ago

Appflowy

An open-source collaborative workspace that combines AI capabilities with data privacy, featuring local AI models, customizable views, and cross-device synchronization.

Alternative to:

Notion

Privacy-focused AI workspace for seamless collaboration

Stars
65,210
Forks
4,531
Last commit
6 days ago

Maybe

The OS for your personal finances. The open-source financial management system that helps you track, analyze, and optimize your personal finances with complete data privacy.

The OS for your personal finances

Stars
53,234
Forks
4,442
Last commit
1 month ago

Affine

A versatile open-source workspace that combines document editing, whiteboarding, and project management with AI-powered features

Alternative to:

Notion

Write, draw, and plan seamlessly in one unified workspace

Stars
54,740
Forks
3,717
Last commit
18 hours ago

Cal

A customizable open source scheduling platform that integrates with your calendar, offering automated booking, reminders, and payments for individuals and businesses.

Alternative to:

Google Meet

Schedule meetings without the back-and-forth hassle

Stars
37,838
Forks
10,391
Last commit
6 hours ago

Jan

Open-source desktop application that lets you chat with AI models locally on your device, with no data sent to the cloud and full control over your conversations.

Alternative to:

ChatGPT

Privacy-focused AI assistant that runs completely offline

Stars
37,611
Forks
2,222
Last commit
9 hours ago

Daisy UI

A powerful Tailwind CSS plugin that provides semantic component classes, reducing code complexity while maintaining full customization flexibility.

Alternative to:

Bootstrap

Elegant UI components for faster Tailwind development

Stars
38,504
Forks
1,529
Last commit
15 hours ago

Materialize

A responsive front-end framework that implements Google's Material Design guidelines with pre-built components and smooth animations.

Alternative to:

Bootstrap

Modern CSS framework with Material Design principles

Stars
38,975
Forks
4,697
Last commit
24 days ago

Outline

A fast, collaborative knowledge base platform featuring real-time editing, powerful search, and seamless integrations for better team documentation.

Alternative to:

Notion

Modern team wiki for seamless knowledge sharing

Stars
34,884
Forks
2,833
Last commit
20 hours ago

Jitsi Meet

A fully encrypted, open-source video conferencing platform offering HD audio, screen sharing, and collaborative features - all without requiring registration.

Alternative to:

Google Meet

Secure, free video conferencing without accounts

Stars
26,988
Forks
7,398
Last commit
6 hours ago

Focalboard

A versatile project management platform offering Kanban boards, calendars, and customizable templates with real-time collaboration features.

Alternative to:

Notion

Open source project management that puts you in control

Stars
24,905
Forks
2,314
Last commit
23 days ago

Plandex

A powerful open-source AI coding assistant that handles large projects with features like diff review, smart context management, and multi-model support.

Terminal-based AI coding agent for complex projects

Stars
14,391
Forks
1,010
Last commit
17 days ago

UI Kit

A lightweight and modular front-end framework offering extensive UI components and tools for building fast, responsive web interfaces.

Alternative to:

Bootstrap

Modern UI components for responsive web development

Stars
18,471
Forks
2,323
Last commit
21 hours ago

Midday

All-in-one platform combining invoicing, time tracking, and financial management with AI assistance to automate tedious business tasks.

Smart financial management for modern businesses

Stars
11,709
Forks
1,063
Last commit
8 hours ago

Ubicloud

Self-hosted or managed cloud platform offering compute, storage, and PostgreSQL services at 3-10x lower costs than traditional cloud providers.

Alternative to:

AWS

Cost-effective, open source cloud infrastructure platform

Stars
10,177
Forks
455
Last commit
7 hours ago

Minecraft Forge

Community-driven forum for Minecraft Forge development, providing mod support, tutorials, and discussions for both users and developers.

The central hub for Minecraft modding development

Stars
7,295
Forks
2,758
Last commit
1 day ago

Mineflayer

Build sophisticated Minecraft bots with features like pathfinding, inventory management, combat, and automated tasks using JavaScript or Python.

Powerful JavaScript API for creating Minecraft bots

Stars
6,046
Forks
1,088
Last commit
16 days ago

GIMP

A powerful, free and open-source image editor with advanced tools for photo manipulation, graphic design, and digital art creation.

Professional-grade image editing for everyone

Stars
5,645
Forks
764
Last commit
8 hours ago

Cuberite

High-performance Minecraft server written in C++ supporting Java Edition 1.8-1.12.2, offering enhanced speed and lower resource usage.

Fast C++ alternative to vanilla Minecraft server

Stars
5,239
Forks
648
Last commit
7 days ago

PocketMine

Open-source server platform that enables full control and customization of Minecraft: Bedrock Edition servers with extensive plugin support.

Custom Minecraft Bedrock server software built in PHP

Stars
3,416
Forks
1,610
Last commit
9 hours ago

CocoIndex

Open-source engine for building scalable data pipelines with custom transformations and incremental updates, specialized for semantic search and RAG applications.

Cloud-native data pipeline for semantic search and RAG

Stars
2,735
Forks
176
Last commit
1 day ago

Minecraft Overviewer

A powerful world rendering tool that transforms Minecraft worlds into detailed, interactive maps using LeafletJS for smooth navigation and exploration.

Create stunning high-res maps of your Minecraft worlds

Stars
3,423
Forks
475
Last commit
9 months ago

Bukkit

Official discussion forums for the Bukkit project, where server admins and plugin developers collaborate and share Minecraft modding resources.

Community hub for Minecraft server modding

Stars
2,440
Forks
1,043
Last commit
2 years ago

Languine

A developer-focused localization platform that integrates with your workflow to automate translations across multiple file formats and languages.

Seamless localization automation for modern development

Stars
1,886
Forks
128
Last commit
5 months ago

CoMaps

A community-powered navigation app offering offline maps, battery-efficient routing, and complete privacy protection for hikers, cyclists, and drivers.

Privacy-focused offline navigation for all adventures

Stars
132
Forks
7
Last commit
23 hours ago

Capgo

Send real-time updates to your Capacitor apps with end-to-end encryption, channel-based distribution, and full analytics - all without App Store reviews.

Alternative to:

Capawesome

Instant app updates without App Store delays

Stars
152
Forks
65
Last commit
10 hours ago

Comma

A minimalist blogging platform featuring rich text editing, analytics, email collection, and custom domain support for a seamless writing experience.

Alternative to:

Wordpress

Simple, elegant blogging for modern creators

Stars
171
Forks
20
Last commit
2 days ago

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Notion

Notion is a writing, planning and collaboration tool. . Capture thoughts, manage projects, or even run an entire company.

4 alternatives