Vikunja — #1 Alternative to Trello
Open-source self-hostable task manager with Kanban, Gantt, List, and Table views
Single-binary Go backend and clean Vue frontend supporting CalDAV sync, Trello imports, subtasks, and fine-grained team namespaces.
License: AGPL-3.0 · Pricing: Free & Open Source · Compare all Trello alternatives · Official Website