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CodeChef is a competitive programming community of programmers from across the globe.

Codeforces is a website that hosts competitive programming contests.

The two rival spymasters know the secret identities of 25 agents. Their teammates know the agents only by their CODENAMES. The teams compete to see who can make contact with all of their agents first. Spymasters give one-word clues that can point to multiple words on the board. Their teammates try to guess words of the right color while avoiding those that belong to the opposing team.

CodePen is an online community for testing and showcasing user-created HTML, CSS and JavaScript code snippets.

CodeSandbox is an online code editor and prototyping tool that makes creating and sharing web apps faster

Codewars is where developers achieve code mastery through challenge. Train on kata in the dojo and reach your highest potential.

CodinGame is a web site to learn programing

Coinbase is a secure online platform for buying, selling, transferring, and storing digital currency.

CoinMarketCap is the world's most-referenced price-tracking website for cryptoassets in the rapidly growing cryptocurrency space.

Color-coded lyrics for songs from Korea, Japan, Taiwan, Thailand and China

combi.fm is a platform-agnostic music service for listening with friends.

Watch the latest Comedy Central shows such as South Park, The Daily Show, and more.