I've been hosting a project management application called Kanboard for some time.

I'm impressed with the ease and stability of this open source software. It's a mature application with an impressive range of addons suitable for all types of project management. But it really excels through its simplicity and no nonsense approach.

I run several workshops with more than 30 participants each time, who were simultaneously using the application on my small server. Load wise, the server barely registered that number of users, while the speed/ responsive was impressive.

If you'd like to explore #Kanboard or just have a look around, I will provide you with accesses to: https://projects.hubup.pro