Godello

Trello inspired kanban board made with the Godot Engine and GDScript, with a real-time collaborative backend (Elixir and Phoenix Channels) and a local backend for offline usage (Godot Custom Resources). Maintained by alfredbaudisch on GitHub, where it has earned 881 stars from the community.

It's actively developed around godot-engine, elixir, phoenix-framework, and is a solid reference for anyone building with these tools.