Slack Overflow - A programmer's best friend, now in Slack.
Google Analytics by SumoMe - The easiest way to see your Google Analytics
GitCommands - An interactive reference tool for Git commands
Metric.live - Real-time and advanced periodic alerts for Google Analytics.
GitHub + Slack Integration - Full visibility into your GitHub projects right inside Slack
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.