I recently deemed my last project - qtile-bonsai (https://github.com/aravinda0/qtile-bonsai) as 'complete software', with a final release.
It is a layer on top of the qtile window manager that allows for more advanced window arrangements - especially subtabs. It was an itch to scratch and I use it myself.
I am now diddling about with Rust and thinking of trying my hand at a PDF parser library. It's sort of nice when there's an established specs document - like all the requirements are clearly laid out and you don't have to spend time thinking about the scope and product design.
I can implement as much as I want to, have tests, and come back another time when I feel like it.