UXPin + Slack - Keep tabs on design projects in Slack
Paco - Never miss a thing on Slack — be more calm and productive
StatusOk (Open source) - Get notified through Slack/email when your website is down
awesome - A dynamic window manager for the X Window System developed in the C and Lua programming languages.
Attentive - A marketing channel, built for retail & e‑commerce
Lowdown - Lowdown unleashes the valuable content locked within Slack and emails it to your members so they don't miss key information.