Open Source #cross-platform Projects

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

An agentic development environment built on a modern Rust terminal emulator with AI-powered coding features.

Self-hosted library and reading platform for ebooks, audiobooks, PDFs, and comics with built-in web readers and Kobo/KOReader sync.

Free cross-platform password manager compatible with KeePass, available as a desktop and web app.

Open-source platform for fine-tuning and running LLMs locally — 2x faster training with 70% less VRAM. Supports LoRA, QLoRA, DPO, GRPO.

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

Free, open source mind mapping and knowledge management desktop app for Windows, macOS and Linux with scripting, LaTeX and add-ons.

Open source game engine that reimplements early Westwood classics including Command & Conquer: Red Alert, Tiberian Dawn, and Dune 2000.

Open source automation tower defense RTS — build factories, mine resources, and defend your core against waves of enemies.

Open source base-building and factory-automation puzzle game inspired by Factorio — extract, cut, rotate, and combine shapes on an infinite map.

Cross-platform desktop app that removes EXIF and hidden metadata from 90+ file formats before sharing.

Free open-source non-linear video editor with hardware-accelerated compositing and cross-platform support.

Free, open-source cross-platform TOTP authenticator with self-hostable sync backend, built with Flutter.

Privacy-respecting mobile book tracker for iOS and Android, built with Flutter — your library lives on your device.

The best and simplest open-source tool for website change detection, page monitoring, and alerts. Self-hostable with Docker or use the SaaS plan.

Self-hosted, cross-platform reading server for manga, comics, and ebooks with responsive web readers and an OPDS feed.

Privacy-first password manager with built-in email aliasing. Fully encrypted and self-hostable.

Bonjourr is a minimalist and lightweight startpage inspired by iOS for Chrome, Firefox, Edge, and Safari. Customize backgrounds, links, and widgets to launch your day beautifully.

Free, open source turn-based strategy game set in a high-fantasy world, with single-player campaigns and online multiplayer.

Scratch is a minimalist, offline-first markdown note-taking app for macOS, Windows, and Linux. Plain text files, keyboard-driven, with no cloud lock-in or account required.

Open source network backup and recovery for mixed IT environments with disk, tape, and S3 storage, a web UI, and multi-OS clients.

Client/server backup system combining file and image backups with fast incremental backups, a web admin UI, and bare-metal restore.

Free, open-source disk cleaner for Windows, macOS and Linux. Find caches, large files, duplicates and app leftovers, see where your space goes, and review files before deleting them.

Open-source 2D drafting and 3D modeling CAD app built with Rust. Reads and writes DWG/DXF natively with desktop and browser builds.

OpenShot is a free, open-source video editor for Linux, macOS, and Windows with unlimited tracks, keyframe animation, and 3D titles.