Have you rebuilt any existing tool yourself?

Has anyone here rebuilt something they use daily because the official product has a quirk / bug that annoys you?
For example - I use Termius to connect to servers over SSH but on my Ubuntu 26 Desktop, Termius is buggy to the point of being unusable.
So - I recreated it using Claude, with one or two improvements. Now I run my version in Docker whenever I need to use it.