List of free project-manager stuff for developerππ½
If you're looking for all programming tools around project-manager (not just free). Check this page List of project-manager Programming Tools

Focalboard
Focalboard is an open source alternative to tools like Asana, Trello, and Notion. Available as a stand-alone application or integrated into the Mattermost platform.
Tag: project-manager
Self hosted
Free self host Community edition