WorksHub - Helping Software Engineers find paid work, learn and get hired through Open Source contributions. WorksHub is made up of computer scientists, machine learning experts and the best in talent acquisition.
NumWorks - The graphing calculator that makes learning math easier.
Hacker Noon - How hackers start their afternoons.
Learney - Knowledge aggregator for developers
Indie Hackers - Connect with fellow entrepreneurs, developers, and bootstrappers who are sharing the strategies and revenue numbers behind their companies.
eMathHelp.net - Site is created to help people learn math. Includes algebra, calculus, differential equation calculators and notes with many examples.