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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Open-source data integration for modern stacks
Stars
5,129Last commit
40 minutes agoLicense
MIT
Collect, transform, and sync data across your entire infrastructure with a flexible, code-based approach to data integration.
Open Source Alternative to:
Free open-source appointment booking for any business
Stars
4,481Last commit
4 days agoLicense
GPL-3.0
Self-hosted appointment scheduling solution with Google Calendar sync, customizable workflows, and no monthly fees. Perfect for healthcare, salons, and service businesses.
Open Source Alternative to:
Effortlessly manage events and sell tickets online
Stars
4,125Last commit
10 hours agoLicense
Unknown
Hi.Events is a comprehensive platform for event management and online ticket sales, offering features like QR code check-in, custom ticket types, and embeddable widgets.
Open Source Alternative to:
Stateful AI agents that remember, learn, and improve over time
Stars
Stars growing over the last 30 days3,790Last commit
1 hour agoLicense
Apache-2.0
Build persistent AI agents with continuous memory, scheduled tasks, and multi-channel communication via Slack, Discord, and Telegram, using your own API keys.
Open Source Alternative to:
The definitive self-hosted URL shortener
Stars
5,405Last commit
4 days agoLicense
MIT
Keep control over all your shortened URLs by serving them under your own domains with this simple yet powerful tool.
Open Source Alternative to:
Self-hosted team workspace with chat, docs, and databases
Stars
5,187Last commit
7 months agoLicense
Apache-2.0
Local-first collaboration platform combining real-time chat, rich text pages, databases, and file management in a single self-hostable workspace.
Open Source Alternative to:
Build powerful websites with the open-source CMS
Stars
4,295Last commit
22 hours agoLicense
GPL-2.0
A flexible and extensible content management system for creating dynamic websites and digital experiences
Open Source Alternative to:
Craft flexible, powerful websites with ease
Stars
4,915Last commit
18 hours agoLicense
Unknown
A flat-file CMS that combines simplicity and flexibility, empowering developers to build custom websites without database complexity.
Open Source Alternative to:
YAML-defined workflow orchestration, no database required
Stars
Stars growing over the last 30 days4,549Last commit
40 minutes agoLicense
GPL-3.0
Single-binary workflow orchestrator that runs scheduled DAGs locally or over SSH, with retries, human tasks, a built-in Web UI, and file-based state storage.
Open Source Alternative to:
Lightweight distributed storage for self-hosting
Stars
Stars growing over the last 30 days4,830Last commit
13 days agoLicense
AGPL-3.0
Self-contained distributed object storage with S3 API compatibility. Runs on minimal hardware, replicates data across 3 zones for maximum resilience.
Open Source Alternative to:
A spreadsheet engine you can embed, self-host, or run in the browser
Stars
4,251Last commit
35 minutes agoLicense
Apache-2.0
IronCalc is an open-source, Rust-powered spreadsheet engine with .xlsx support, 300+ functions, and bindings for JavaScript and Python.
Open Source Alternative to:
System-wide ad-blocking and privacy protection, no extensions needed
Stars
4,353Last commit
11 hours agoLicense
MIT
Free, open-source desktop app that blocks ads, trackers, and surveillance scripts across all browsers and apps on Windows, macOS, and Linux.
Open Source Alternative to:
Open-source helpdesk for seamless customer support
Stars
4,643Last commit
4 hours agoLicense
AGPL-3.0
Self-hosted email management system with shared inboxes, automation, and powerful collaboration features for efficient customer support.
Open Source Alternative to:
Feature-rich backend that runs anywhere you need it
Stars
3,780Last commit
6 days agoLicense
Apache-2.0
Lightweight Firebase alternative with database, auth, storage, and workflows. Framework-agnostic backend that integrates with NextJS, Remix, Hono and more.
Open Source Alternative to:
Build powerful backends without leaving your browser
Stars
6,845Last commit
2 years agoLicense
Apache-2.0
A low-code platform for creating robust backends, complete with a spreadsheet UI for easy data management and custom functions.
Open Source Alternative to:
Open-source platform for collecting and prioritizing feedback
Stars
4,601Last commit
17 hours agoLicense
AGPL-3.0
A self-hosted community feedback tool that helps organizations gather, discuss, and prioritize user suggestions and feature requests.
Open Source Alternative to:
Open source security automation platform for builders
Stars
3,895Last commit
3 hours agoLicense
AGPL-3.0
Tracecat is a scalable, self-hostable platform for automating security workflows and playbooks without limits.
Open Source Alternative to:
Open-source growth platform for customer-centric teams
Stars
4,112Last commit
32 minutes agoLicense
AGPL-3.0
All-in-one solution for marketing, sales, and customer service. Boost engagement, streamline workflows, and drive growth.
Open Source Alternative to:
Secure, policy-based access control for modern applications
Stars
4,646Last commit
38 minutes agoLicense
Apache-2.0
A scalable authorization layer that provides fine-grained access control through externalized policies, enabling secure and flexible permissions management.
Open Source Alternative to:
Free office suite with Microsoft compatibility
Stars
Stars growing over the last 30 days4,607Last commit
28 minutes agoLicense
GPL-3.0
Complete free office suite compatible with Microsoft formats (.doc, .docx, .xls, .xlsx, .ppt, .pptx). Open source alternative with regular updates.
Open Source Alternative to:
Create powerful forms with ease and flexibility
Stars
Stars growing over the last 30 days3,989Last commit
15 hours agoLicense
AGPL-3.0
A versatile open-source form builder for collecting data, managing submissions, and integrating with your favorite tools.
Open Source Alternative to:
Open-source ticketing system for streamlined support
Stars
3,484Last commit
2 days agoLicense
AGPL-3.0
Frappe Helpdesk consolidates customer issues, automates workflows, and empowers self-service to boost agent productivity and customer satisfaction.
Open Source Alternative to:
High-performance graph computing for scalable data analysis
Stars
4,648Last commit
18 minutes agoLicense
Unknown
Memgraph is a scalable, in-memory graph database solution offering high-performance computing and Neo4j compatibility.
Open Source Alternative to:
Git-native feature management for developers
Stars
4,938Last commit
4 hours agoLicense
GPL-3.0
A feature flag platform that integrates with Git workflows, enabling developers to manage features directly in their codebase.
Open Source Alternative to:
Track coding time effortlessly, gain insights instantly
Stars
4,470Last commit
13 days agoLicense
MIT
Open-source, self-hosted time tracking solution for developers. Analyze coding habits, improve productivity, and visualize progress.
Open Source Alternative to:
Automate financial processes for smarter business decisions
Stars
Stars growing over the last 30 days4,074Last commit
1 day agoLicense
AGPL-3.0
Cloud-based accounting software that streamlines bookkeeping, generates intelligent reports, and offers multi-currency support for efficient financial management.
Open Source Alternative to:
Open source observability platform for modern applications
Stars
4,311Last commit
15 days agoLicense
AGPL-3.0
Uptrace is an OpenTelemetry-based platform that integrates traces, metrics, and logs to help monitor and optimize complex distributed systems.
Open Source Alternative to:
One API to deploy and run agents on any model or machine
Stars
Stars growing quickly over the last 30 days3,359Last commit
2 hours agoLicense
Apache-2.0
Production-ready agent infrastructure that handles state, machines, permissions, and history so you don't have to build the platform yourself.
Open Source Alternative to:
Secure and elegant Matrix client for seamless conversations
Stars
3,972Last commit
16 hours agoLicense
AGPL-3.0
Cinny offers a simple, elegant, and secure interface for Matrix-based conversations, protected by end-to-end encryption.
Open Source Alternative to:
Self-hosted photo management with full control
Stars
4,330Last commit
11 hours agoLicense
MIT
Free photo management tool that runs on your server. Upload, organize, and share photos with beautiful interface, EXIF support, and complete privacy control.
Open Source Alternative to:
Embedded storage engine built on object storage
Stars
Stars growing over the last 30 days3,622Last commit
8 hours agoLicense
Apache-2.0
SlateDB is an embedded storage engine that leverages object storage for durability, scalability, and simplified replication without the need for disk management.
Open Source Alternative to:
Your digital identity, beautifully organized
Stars
3,941Last commit
11 days agoLicense
AGPL-3.0
A free, open-source link management platform for creating customizable, self-hosted link pages to showcase your online presence.
Open Source Alternative to:
AI-powered platform for engineering LLM products
Stars
Stars growing over the last 30 days3,474Last commit
8 hours agoLicense
Apache-2.0
Laminar is an open-source platform that helps collect, understand, and utilize data for building high-quality LLM applications.
Open Source Alternative to:
Open source agency management tool for streamlined success
Stars
Stars growing over the last 30 days3,296Last commit
19 minutes agoLicense
AGPL-3.0
Worklenz is a comprehensive project management platform that helps agencies organize tasks, track resources, and boost productivity.
Open Source Alternative to:
Open-source code security engine for developers
Stars
Stars growing over the last 30 days3,291Last commit
15 hours agoLicense
LGPL-2.1
Opengrep is a community-driven fork of SemgrepCE, providing accessible static code analysis and security scanning for developers.
Browser and notebook combined with local-first AI
Stars
3,620Last commit
2 months agoLicense
Apache-2.0
A browser that doubles as a personal notebook, letting you research, summarize, and take notes on web pages, PDFs, and videos without switching apps.
Open Source Alternative to:
Scalable SQL database for real-time analytics
Stars
4,449Last commit
10 hours agoLicense
Apache-2.0
Distributed SQL database designed for high-speed ingestion and complex queries on massive datasets, ideal for IoT and time-series data.
Open Source Alternative to:
Next-gen WebSockets server for real-time apps
Stars
5,635Last commit
2 years agoLicense
AGPL-3.0
Open-source, Pusher-compatible WebSockets server that's simple, fast, and resilient for building real-time applications.
Open Source Alternative to:
Effortlessly split expenses with friends and roommates
Stars
3,044Last commit
23 hours agoLicense
MIT
A user-friendly app for tracking shared expenses, settling debts, and managing group finances with ease and transparency.
Open Source Alternative to:
Quick access to apps and files with keyboard shortcuts
Stars
4,615Last commit
14 days agoLicense
MIT
A keyboard-driven launcher that helps you quickly find and open applications, files, and bookmarks across Windows, macOS, and Linux
Open Source Alternative to:
Create stunning data visualizations with ease
Stars
4,067Last commit
1 day agoLicense
MIT
A powerful, open-source platform for building interactive dashboards and charts from multiple data sources without coding.
Open Source Alternative to:
Create engaging surveys and gather valuable insights
Stars
3,789Last commit
11 hours agoLicense
Unknown
LimeSurvey is a powerful open-source tool for creating customizable online surveys, polls, and questionnaires.
Open Source Alternative to:
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