Taiga to manage projects. It’s as easy and pleasant to use as Trello, but with velocity/burndown charts and the whole “agile” thing, but you can also turn parts of it on and off (per project even).
Trilium completely cured me of messy note-taking habits, simply by winning on the convenience side. I was firmly in the “folder tree of markdown documents” and “my Sublime Text tabs of random notes have no number” camp before.
I’m considering Habitica which lets you set up rewards and achievements for your real life (i.e. apply addictive reward/progress loop from video games to motivate your real self to do things). Also Wger for exercise tracking, but I’m not sure they’re the right thing for my ticket/tracking-averse self (I wish there was something that covered the whole MyFitnessPal/FitDay and the whole Polar Personal Trainer/Garmin Connect side, but FOSS and self-hosted).
For leisure, I also run Stash (it bills itself as an organizer for your porn library, but it’s really good for any kind of clips), Jellyfin for my music and movies and currently both Mango and Kavita for books and comics.