Challenge Hunt is a side project that I and my friend wrote. It shows you all the active and upcoming challenges from around 25 platforms including TopCoder, CodeForces, HackerRank, Kaggle and the likes. The idea of Challenge Hunt came to us when we had to go on check 3-4 websites every time we sat down to solve some competitve programming problem. The project is open source:
https://github.com/ChallengeHunt/challengehuntIf you want to know more about it follow this blog post that I wrote http://architv.me/challenge-hunt-from-idea-to-execution/