Android app and Chrome and Firefox addons that lists live and upcoming programming competitions on sites like Codeforces, Topcoder, Hackerrank, Hackerearth, Codechef etc
https://play.google.com/store/apps/details?id=com.corphots.c... https://chrome.google.com/webstore/detail/coders-calendar /bageaffklfkikjigoclfgengklfnidll https://addons.mozilla.org/en-US/firefox/addon/coder-calenda...
Has 7k+ users all together :)