GitHub + Slack Integration - Full visibility into your GitHub projects right inside Slack
Stork.ai - AI-Based Collaboration for Hybrid Teams. Rich media messaging, advanced video and voice conferencing, auto-transcribing and screen sharing. Serendipitous meetings at the water-cooler with your human and AI teammates.
Stack Overflow Documentation - A crowdsourced developer documentation
Tatsu - Standup meetings for remote teams.
ask-stack - Get answers from Stack Overflow directly in the Atom editor
openmeet - Account free video conferencing with a rooms component that lets you use VC within a physical meeting room. The server can also be hosted in your own cloud for extra privacy/security.