Mine in similar, I implement an authoritative domain name server. I've done it in something like 20-25 languages now. The only language I've learned in the last decade I didn't write one in is ARM Assembly. I am not that "dedicated" (more like masochistic) enough to try to do one in assembly.
I tend to reimplement the Linux kernel from scratch a few times in every language and go from there onto the X server, desktop environment, networking stack, etc.
