Hacker Noon - How hackers start their afternoons.

hackattic - No nonsense, real world programming challenges

Indie Hackers - Connect with fellow entrepreneurs, developers, and bootstrappers who are sharing the strategies and revenue numbers behind their companies.

Code Fight Club - A fight club you can talk about. Less punching, more coding.

Hashnode App - Hashnode is a free blogging platform for developers who want to plug into the global dev community while retaining ownership of their content.

Codewars - Achieve code mastery through challenge.