A free library for people who build things.

Connect Books is a free collection of technical books, study guides and cheat sheets for IT and software professionals. Every resource is hosted for direct download — no account, no paywall, no catch.

We curate material across networking, cloud, security, Linux, data, DevOps and programming, and keep it current with the latest certification objectives. If it helps you pass an exam or ship better work, it belongs here.

Connect Books is part of the Connect 4 Techs family. Questions or a book request? Reach out any time.