Django
Used by 7 peopledjangoproject.com ↗

“My team and I maintain a Python Django web server, which provides a web-based user interface to our database.”
Victor Hanson-Smith Interview, Computational biologist · via Uses This 

“I'm a co-creator and co-BDFL of the Django Web framework.”
Adrian Holovaty Interview, Web developer (EveryBlock, Django), musician · via Uses This 
“It's by far the fastest machine I've ever owned; our compile time for Instagram went from 100 seconds to about 10 secs, and our Django unit tests run in an tenth the time as well.”
Mike Krieger Interview, Co-founder of Instagram · via Uses This 
“For photo curating, I have an awesome custom admin built on Django by Jeff Croft.”
Laura Brunow Miner Interview, Editor, designer, event inventor (Pictory, Phoot Camp) · via Uses This 
“When I lived in Lawrence, I helped create the original version of the Django web framework.”
Wilson Miner Interview, Web designer (Rdio) · via Uses This