Restyaboard is an open source alternative to Trello, but with smart additional features like offline sync, diff /revisions, nested comments, multiple view layouts, chat, and more. And since it is self-hosted, data, privacy, and IP security can be guaranteed.
Restyaboard is more like an electronic sticky note for organizing tasks and todos. Apart from this, it is ideal for Kanban, Agile, Gemba board and business process/workflow management. It can be extended with productive plugins
Today, several universities, automobile companies, government organizations, etc from across Europe take advantage of Restyaboard.
This document contains information about how to install Restyaboard in NixOS.