GitHub + Slack Integration - Full visibility into your GitHub projects right inside Slack
Stack Overflow Documentation - A crowdsourced developer documentation
Cryotos - #1 Maintenance Management Software
ask-stack - Get answers from Stack Overflow directly in the Atom editor
Codacy - Automatically reviews code style, security, duplication, complexity, and coverage on every change while tracking code quality throughout your sprints.
GitCommands - An interactive reference tool for Git commands