Tippy.js - lightweight, pure JavaScript tooltip library
Learn Enough Command Line to Be Dangerous by Michael Hartl an introduction to the Unix command line. Brief and really informative.
LinuxJourney.com - now I know where to redirect my #Linux-newbie friends. Even more, I will go through it by myself!
Tippy.js - lightweight, pure JavaScript tooltip library
DO_Snapshot - command-line snapshot maker for your DigitalOcean droplets.
MetaBase is the easy, open source way for everyone in your company to ask questions and learn from data.
MailHog - Web and API based SMTP testing, inspired by MailCatcher
Localstack - a fully functional local AWS cloud stack. Develop and test your cloud apps offline!