Description: Codeforces is an online platform for competitive programming contests. It features regular contests in different formats, an online judge system to practice solving programming problems, forums for discussion, and more.
Type: software
Pricing: Free
Description: DMOJ is an open source automated judging system for competitive programming contests. It allows contest organizers to easily host programming competitions without needing to set up manual judging infrastructure.
Type: software
Pricing: Open Source