LibreLingo's mission is to create a modern language-learning platform that is owned by the community of its users. All software is licensed under AGPLv3, which guarantees the freedom to run, study, share, and modify the software. Course authors are encouraged to release their courses with free licenses.
LibreLingo offers an official web app, which is very lightweight and written in Javascript using Svelte framework and pouchDB by the way, to try out LibreLingo courses interactively right in your browser, no installation required!