Open source multi-platform projects
Every project in the registry tagged multi-platform, ranked by real GitHub adoption.
Free 2D and 3D game engine for cross-platform projects
Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies
Stride (formerly Xenko), a free and open-source cross-platform C# game engine.
🏖️ A serverless, open-source file hosting solution built on Cloudflare. Supports image hosting, secure file storage, and personal cloud drive capabilities.
Redot Engine – Multi-platform 2D and 3D game engine
Murder is a pixel art ECS game engine.
Open-source, self-hostable social media management platform. Schedule, publish, and manage content across 10+ platforms from a single dashboard. Free alternativ
Community effort to maintain and improve Jedi Academy (SP & MP) + Jedi Outcast (SP only) released by Raven Software
Related tags
Frequently asked questions
How many open source multi-platform projects are there?
This registry tracks 8 projects tagged multi-platform, with 225,587 GitHub stars between them. The most-adopted is Godot at 119,413 stars.
Are these multi-platform projects free to use?
Yes — 8 of the 8 carry an explicit open-source licence across 3 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which multi-platform project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these multi-platform projects still maintained?
8 of the 8 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.