Languages don’t matter too much but like most developers I’ve worked with a lot. In the past few years I have focussed on C, Go, PHP and JavaScript.
Enlightenment
I’m an enlightenment developer. We have users too. You either love Enlightenment or you hate it.
Themes
rasterman put a lot of work into the flat theme and color classes, it’s a remarkable feat. The only issue I have is that I hate the theme. Therefore here’s dark which is complete and skeumorphic and beautiful.
Evisum
https://git.enlightenment.org/enlightenment/evisum.git

Enigmatic
There is a successor to evisum called enigmatic.
https://git.enlightenment.org/netstar/enigmatic.git
Linux and OpenBSD
Sometimes I do some kernel work. I have worked on Linux and OpenBSD projects.
Here’s an example for the Raspberry Pi 4 on OpenBSD arm64:
https://man.openbsd.org/bcmtmon
Github
There’s a load of “stuff” on Github.