Open Source Software Alternatives

Self-hosted personal nutrition tracker with PWA and Android app. No telemetry, no cloud sync, full data ownership.

An open-source, self-hostable SEO suite and pay-as-you-go alternative to Semrush and Ahrefs for keyword research, rank tracking, backlinks, and site audits.

Free and open-source HTML5 network performance estimation tool using only built-in web APIs — no third-party frameworks required.

Open-source, local-first screen recorder and timeline video editor for macOS and Windows with AI subtitle generation.

S3 gateway that translates S3 API requests to filesystem, Azure Blob, ScoutFS, or other S3 backends.

Teable is a no-code spreadsheet database on Postgres — a fast, open-source Airtable alternative with views, forms, automations, and developer-friendly APIs for every team.

Cross-platform open-source video editor built on the MLT framework with a wide format support and no import required.

Distributed storage system with S3-compatible object storage, POSIX file system, and Iceberg table support for billions of files.

A free, open-source empire-building strategy game inspired by Civilization, playable in single-player or online.

A free, open-source desktop image editor that replicates the Photoshop interface with 1:1 native PSD/PSB file compatibility.

Self-hosted tasks and notes management with offline support, push reminders, and full-text search in a single Docker container.

An open-source simulation game based on Transport Tycoon Deluxe, letting you build and manage a vast transport empire.

An open-source reimplementation of RollerCoaster Tycoon 2 that expands the original with new features, rides, and multiplayer.

A fast, self-hostable scheduling platform written in Rust, like Cal.com but without Node.js or a database server.

A small, open-source microblogging platform for short notes, following people and hashtags, without engagement tricks.

A free, open-source engine and community project recreating Age of Empires II with a modern C++ and Python codebase.

A self-hostable proxy search engine that queries DuckDuckGo, Brave, Google, Yandex and more without tracking.

An open-source reimplementation of Diablo II's game engine built in Go, with a cross-platform client and modding support.

AI-native design editor with real-time collaboration, component system, and Figma-compatible file format.

A free, open-source real-time strategy game about ancient civilizations, with single-player, multiplayer, and modding support.

Cross-platform ebook reader supporting PDF, EPUB, MOBI, comics and more, with sync across Windows, macOS, Linux, Android, iOS, and Web.

A tiny, fast self-hosted URL shortener written in Rust, with custom slugs, link expiry, hit counts, and an API.

Lightweight, free PDF, eBook, and comic reader for Windows that launches instantly and stays out of the way; multi-format support with minimal interface.

A community-maintained open-source personal finance app for tracking accounts, investments, budgets, and net worth.

The original OpenScreen screen recorder and demo creator, archived after v1.5.0.

Lightweight GTK PDF presenter for dual-screen setups, showing current slide, next slide, and presenter notes on separate displays.

Databuddy is a privacy-first analytics platform with a focus on user experience, with it's foundation built on privacy, it ensures complete compliance with most major data privacy laws out of the box

Open-source CapCut alternative: a privacy-first browser video editor with a timeline, effects, and local editing.

Open source AI gateway and router that exposes hosted, BYOK, local, and custom models through one OpenAI-compatible API.

Open-source macOS clipboard manager with searchable history, ordered Paste Stack, text transforms, and an encrypted Vault for sensitive clips.

A free, open-source real-time strategy game inspired by The Settlers, focused on building economies and thriving settlements.

Open source, drag-and-drop builder for AI agents and LLM workflows. Now archived (EOL Aug 2026) — the Apache 2.0 code lives on for forks and self-hosters.

Cross-platform PDF viewer focused on textbooks and research papers with smart navigation, marks, bookmarks, and bibliography jumping.

Self-hosted PDF manager, viewer, and editor with multi-device sync, tagging, and an in-browser reader; deployable via Docker.

Open-source inventory management for parts, stock, BOMs, and builds, aimed at electronics makers, SMEs, and hobbyists.

Open-source double-entry accounting and inventory platform for small businesses, with invoicing, bank feeds, and reports.

Developer-first, open-source translation management with CLI file sync, a collaborative editor, and a GraphQL API.

Developer-friendly, open-source localization platform with in-context editing, SDKs, and machine translation.

Local-first desktop and Android app for food journaling, weight tracking, and blood pressure monitoring, with no cloud account required.

Frame-accurate video cutter and splitter for Ubuntu and Windows that re-encodes only a few frames per cut.

Cross-platform FFmpeg GUI for lossless video and audio cutting, merging and remuxing — no re-encoding, no quality loss.

Minimal, private, ad-free habit tracker for Android with streak tracking, focus sessions, and GitHub-style activity grids.

Open-source AI pentest agents that run real attacks to find, validate, and fix vulnerabilities in your apps.

A free, local-first budgeting app with zero-based planning, bank sync, and desktop and self-hosted apps.

A free, local PDF editor for mobile, desktop, and web. Annotate, fill forms, sign, and redact with no account or uploads.

Tag and organize photos and files in place, with a tag library stored next to your folders instead of a proprietary catalog.

Open-source to-do list and time tracker with timeboxing, a daily planner, Pomodoro focus sessions, and integrations for Jira, GitHub, and GitLab.

Self-hosted service that turns saved articles and documents into a private podcast feed with cloned-voice narration.

Self-hosted, keyless flight, ship and satellite tracker that keeps a replayable history you own, with source provenance on every contact.

Open-source Pro Tools-style DAW in pure Rust — record, edit, mix and bounce, with MIDI, plugins and agents.

Open-source Word-style word processor in pure Rust — ribbon, styles, tables, track changes and mail merge.