Kanboard is wonderfully simple project and task management application.
The board view gives a nice Trello like interface, where cards can be dragged & dropped across columns.
A really nice and clean user and role management system.
It has a bunch of plugins, like OAuth2, so that third party authentication systems can be used.
And again, like other software that I like, it uses SQLite out of the box which makes moving the entire application around trivial.
Additionally, I’ve started using Caddy V2 which provides LetsEncrypt SSL certificates out of the box and renews them automatically.