Built a social network based around license plate messaging. You might be surprised how many license plate messaging networks exist. Apparently they're more popular to develop than to use.
As a web developer, I've dealt mostly with LAMP stacks with JQuery UIs.
Do a lot of devops scripting in Python, an ample amount in Bash, and a bunch of old Perl scripts I occasionally brush the cobwebs off of.
I've started developing web backends in Python and using WSGIFrameworks for front ends as well, including Django and Flask.