Built this to solve a capacity issue in a small team w/in a F100 company. People didn't hate it, which ends up one of the biggest compliments project collaboration software can earn. It's a niche within a niche in a some ways, but I got perm to put it online for others to use.
AngularJS, Django15, RabbitMQ, lots more.
I need to fix the upload limit but for now it's basically XML edition MPP files < 1Mb if memory serves.