use or used
#Debian
I've used Debian since I've stopped with Slackware (see below): testing on my laptop and stable on my server (with LXC containers for services).
The plan has been to get involved in the distribution to improve it in the areas I need. So far I haven't had time for that, especially since getting involved in Debian is a fairly slow-starting process.
#Ansible, LXC and Incus
I self-host several services in `Incus` containers using Ubuntu cloud images. I used to do it with LXC with self-built root filesystems.
I used to orchestrate my setup with Ansible. For it to be a good match, it would have required me to spend much more time on it and to treat my containers as fully-disposable (which would itself have required even more time). Moreover it requires Python in the containers and it cannot handle newer OSes in containers. Plus it's really slow and uses a lot of CPU even when idle.
#OCaml
I've started OCaml 20 years ago and contributed some code to it, including in the build system part for better Windows support. That was back when SVN was still used and someone else had to commit for me (but attributed in commit messages). The best way to find them is to use git log or search through Github
I've been taking care of its IRC channels for more than a decade.
#Vim
I tried emacs first but my fingers didn't like it (maybe because of the keyboard) and I couldn't remember the keypresses nor find their meaning.
I've been using vim for 15 years now. A lot I could still learn but I'm able to do everything I want and need more than a couple times.
#Slackware (past)
I really started Linux with Slackware (with only a couple years of OpenSUSE before that). I really liked it and knew it and my systems really well. Unfortunately the project development is closed and that frustrated me too much. If only there were a public bug tracker, even read-only!