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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Design database diagrams and generate SQL scripts instantly
Stars
40,327Last commit
1 day agoLicense
AGPL-3.0
Free online database diagram editor with SQL generation. Create ER diagrams, visualize relationships, export scripts, and reverse engineer schemas - no signup required.
Open Source Alternative to:
Privacy-first knowledge base that connects your notes
Stars
45,592Last commit
5 hours agoLicense
AGPL-3.0
Local-first, open-source knowledge management tool with bidirectional linking, outlines, flashcards, PDF annotations, and whiteboards for building a connected second brain.
Open Source Alternative to:
Omnichannel customer support with a built-in AI assistant
Stars
Stars growing over the last 30 days39,885Last commit
1 day agoLicense
MIT
Manage customer conversations across live chat, email, WhatsApp, Instagram, and more from one inbox, with an AI assistant that suggests replies and automates common questions.
Open Source Alternative to:
Build internal tools rapidly without coding
Stars
41,228Last commit
4 hours agoLicense
AGPL-3.0
Open-source low-code platform for creating custom internal tools, dashboards, and admin panels with a drag-and-drop interface
Open Source Alternative to:
Local AWS emulator with no account, gates, or paid tiers
Stars
Stars growing quickly over the last 30 days31,736Last commit
4 hours agoLicense
MIT
Run AWS services locally in development and CI without an account, quotas, or feature restrictions. MIT licensed, no telemetry.
Open Source Alternative to:
Self-hosted Git service that's lightweight and easy to install
Stars
47,936Last commit
4 hours agoLicense
MIT
Lightweight, cross-platform Git service for self-hosting. Easy installation, minimal requirements, runs on Raspberry Pi. 100% open source and free.
Open Source Alternative to:
Open-source coding agent for your IDE and terminal
Stars
36,482Last commit
11 hours agoLicense
Apache-2.0
Runs source-controlled AI checks on every pull request, enforcing your engineering standards as native GitHub status checks with suggested fixes.
Open Source Alternative to:
Unlock Product Insights with Open-Source Analytics
Stars
40,785Last commit
4 hours agoLicense
MIT
All-in-one product analytics platform. Track user behavior, run experiments, and make data-driven decisions to grow your product.
Open Source Alternative to:
Empower your team to build custom internal tools rapidly
Stars
41,250Last commit
7 hours agoLicense
Apache-2.0
Low-code platform for creating powerful internal tools and dashboards with drag-and-drop ease, robust integrations, and customizable workflows.
Open Source Alternative to:
Visual builder for AI agents and LLM workflows
Stars
55,569Last commit
3 months agoLicense
Apache-2.0
Open source platform for building AI agents, chatbots, and multi-agent systems using a drag-and-drop interface, with support for 100+ LLMs and RAG.
Open Source Alternative to:
Manage Linux servers with ease through a modern web interface
Stars
37,448Last commit
7 hours agoLicense
GPL-3.0
Comprehensive web-based tool for Linux server administration with integrated website, database, container, and LLM management capabilities.
Open Source Alternative to:
Local AI meeting transcription with zero data leaving your device
Stars
32,698Last commit
10 hours agoLicense
MIT
Records, transcribes, and summarizes meetings entirely on your device using local AI. No bots, no cloud uploads, GDPR and HIPAA compliant by design.
Open Source Alternative to:
Open-source financial terminal for data-driven insights
Stars
Stars growing over the last 30 days33,798Last commit
2 days agoLicense
AGPL-3.0
Comprehensive financial data platform offering economic insights, market analysis, and portfolio management tools
Open Source Alternative to:
Unified AI-powered enterprise search across company data
Stars
33,395Last commit
4 hours agoLicense
MIT
An open-source platform that connects to 40+ apps to provide intelligent search and AI assistance across all company information
Open Source Alternative to:
Privacy-first metasearch across 270+ sources
Stars
39,550Last commit
15 hours agoLicense
AGPL-3.0
Self-hostable metasearch engine that aggregates results from 270+ sources without tracking or profiling users, with optional JavaScript and Tor support.
Open Source Alternative to:
Cut and trim video without re-encoding or quality loss
Stars
Stars growing over the last 30 days46,035Last commit
21 hours agoLicense
GPL-2.0
Desktop app for lossless video and audio editing. Cut, trim, merge, and remux files in seconds without re-encoding, using FFmpeg under the hood.
Open Source Alternative to:
Secure collaboration platform for mission-critical work
Stars
39,613Last commit
10 hours agoLicense
Unknown
Mattermost provides a flexible, open-source platform for secure team collaboration, designed for organizations with strict security and privacy requirements.
Open Source Alternative to:
Real-time error tracking and performance monitoring
Stars
45,776Last commit
4 hours agoLicense
Unknown
Detect, diagnose, and resolve software issues quickly with powerful error tracking, performance monitoring, and release management.
Open Source Alternative to:
AI coding agent and CLI for complex terminal workflows
Stars
27,773Last commit
2 months agoLicense
Apache-2.0
Terminal-based coding agent powered by Grok 4.5 that plans, builds, tests, and deploys across any codebase with parallel subagents and plugin support.
Open Source Alternative to:
Open-source e-commerce for modern developers
Stars
37,241Last commit
14 hours agoLicense
MIT
Flexible, customizable e-commerce platform with headless architecture, built-in features, and extensive plugin ecosystem for scalable online stores.
Open Source Alternative to:
Zero-config VPN with WireGuard for secure networking
Stars
Stars growing over the last 30 days39,105Last commit
6 hours agoLicense
BSD-3-Clause
Deploy a modern WireGuard-based VPN with zero configuration. Connect devices securely across clouds, VPCs, and on-premises networks without firewall rules.
Open Source Alternative to:
Open source AI coding agent for the terminal and IDE
Stars
Stars growing over the last 30 days30,275Last commit
4 hours agoLicense
Apache-2.0
Terminal-based AI coding agent that reads your codebase, edits files and runs commands, with support for Qwen, OpenAI, Anthropic, Gemini and local models.
Open Source Alternative to:
Scale-out SQL database for real-time analytics
Stars
40,736Last commit
4 hours agoLicense
Apache-2.0
Distributed SQL database combining OLTP and OLAP capabilities, offering horizontal scalability, high availability, and real-time analytics.
Open Source Alternative to:
Build powerful AI knowledge bases with ease
Stars
30,037Last commit
8 hours agoLicense
Unknown
FastGPT is a free, open-source platform for creating AI-powered knowledge bases with data processing, model invocation, and visual workflows.
Open Source Alternative to:
Your personal distributed filesystem
Stars
39,512Last commit
10 hours agoLicense
Apache-2.0
A cross-platform file manager that unifies your devices into a seamless, organized digital workspace.
Open Source Alternative to:
Secure authentication and access control made simple
Stars
37,868Last commit
19 hours agoLicense
Apache-2.0
Comprehensive open source identity management solution offering single sign-on, social login, and fine-grained authorization for applications and services.
Open Source Alternative to:
Fast, collaborative wiki for teams who need organized docs
Stars
41,272Last commit
6 hours agoLicense
BUSL-1.1
Team knowledge base with real-time collaboration, AI-powered search, Slack integration, and self-hosting support for internal docs and wikis.
Open Source Alternative to:
AI coding agent for VS Code, JetBrains, CLI, and Cloud
Stars
27,985Last commit
17 hours agoLicense
MIT
Open source AI coding agent with 500+ models, bring-your-own-key support, and specialized modes for writing, debugging, and planning code across IDEs and CLI.
Open Source Alternative to:
Your personal cloud OS for simple, elegant home servers
Stars
37,644Last commit
6 days agoLicense
Apache-2.0
CasaOS is an open-source personal cloud system that makes it easy to set up and manage your own home server
Open Source Alternative to:
Craft rich text experiences with ease
Stars
39,041Last commit
1 day agoLicense
MIT
A customizable, open-source rich text editor framework for modern web applications, built on Vue and Prosemirror
Framework-agnostic authentication for TypeScript applications
Stars
30,747Last commit
4 hours agoLicense
MIT
A comprehensive authentication framework offering email/password, social sign-on, two-factor auth, and multi-tenant support with full TypeScript integration.
Open Source Alternative to:
Powerful screen capture and file sharing tool for Windows
Stars
41,035Last commit
17 hours agoLicense
GPL-3.0
ShareX is a free, open-source program that captures or records any area of your screen and shares it with a single keypress, supporting various file types and destinations.
Open Source Alternative to:
AI second brain for research, automation, and personal agents
Stars
38,125Last commit
3 months agoLicense
AGPL-3.0
Self-hostable AI assistant that connects to your docs and the web, lets you build agents, schedule automations, and run research with verifiable citations.
Open Source Alternative to:
Secure cloud collaboration platform for organizations
Stars
37,515Last commit
7 hours agoLicense
AGPL-3.0
Nextcloud offers on-premises file sync, sharing and collaboration platform with advanced security and privacy features.
Open Source Alternative to:
Powerful API development and testing made effortless
Stars
40,160Last commit
20 hours agoLicense
Apache-2.0
Intuitive API client for REST, GraphQL, and gRPC. Debug, test, and collaborate on APIs with ease across platforms.
Open Source Alternative to:
Advanced vulnerability detection and management platform
Stars
32,912Last commit
4 hours agoLicense
MIT
Monitor infrastructure for exploitable vulnerabilities with real-time detection, automated workflows, and zero false positives.
Open Source Alternative to:
Open-source data platform for effortless content management
Stars
38,720Last commit
1 day agoLicense
Unknown
A versatile headless CMS and API engine that simplifies data management, content creation, and application development.
Open Source Alternative to:
Fast, scalable vector database for AI applications
Stars
35,556Last commit
1 day agoLicense
Apache-2.0
Qdrant is an open-source vector database that provides high-performance similarity search for AI and machine learning applications.
Open Source Alternative to:
Simple, fast, and secure push notifications for all
Stars
35,549Last commit
16 hours agoLicense
Apache-2.0
A lightweight, open-source solution for sending real-time notifications to your devices, with end-to-end encryption and no sign-up required.
Open Source Alternative to:
Open-source observability platform for cloud-native apps
Stars
32,641Last commit
15 hours agoLicense
MIT
Comprehensive monitoring and troubleshooting solution for microservices architectures, offering metrics, traces, and logs in a single pane.
Open Source Alternative to:
Build data-rich React apps with ease and flexibility
Stars
36,043Last commit
2 months agoLicense
MIT
A React-based framework for rapid development of internal tools, admin panels, and dashboards with powerful data handling capabilities.
Open Source Alternative to:
Save links, notes, and images. AI tags them for you.
Stars
30,524Last commit
8 hours agoLicense
AGPL-3.0
Self-hostable bookmark manager that saves links, notes, images, and PDFs, then automatically tags and organizes them using AI for faster retrieval.
Open Source Alternative to:
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Sent – Messaging Infrastructure for Developers. One API for SMS, WhatsApp, and RCS across 190+ countries.
Highseat
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Stellar Hosted