developerWork

IBM's official developer program, where you can access and download trial software, find abundant IT resources, and communicate with professional IT practitioners.

Algorithms

GitHub's largest open-source algorithm library

MSDN

Search for in-depth articles about Microsoft developer tools and technologies.

Insomnia

Open source, lightweight, and minimalist API client

Dzone

This website covers a wide range of technologies, including cloud platforms, databases, IoT, DevOps, and the Java language.

V2EX

A website that gathers all sorts of interesting and fun topics and trends, V2EX offers a particularly useful tool called 'ZEN' to help you manage your time.

Levels.fyi

Salary data and job level information for the technology industry