Society of Competitive Programmers

Competitive Programmers Union

the CPU is Purdue's community for participating in and discussing competitive programming competitions.

Onto Koinon

Founded in 2008 as Team of Programmers by Adam Cloud (CloudyOne), with key contributor & leader Devon (Shiftybit). Now Onto Koinon — a collective where programmers, developers, and tech enthusiasts build, learn, and push boundaries together, one line of code at a time.https://ontokoinon.com/