Lurchr - Saves all your Slack links, so you can focus on work
Slack Overflow - A programmer's best friend, now in Slack.
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
GitCommands - An interactive reference tool for Git commands
Paperbot (Reloaded) - Slack meets Pocket
GitHub + Slack Integration - Full visibility into your GitHub projects right inside Slack