Whatis - Manage & organize your team's knowledge straight from Slack
Intercom on Product Management - The ultimate resource for aspiring product managers
Slack-News - Read news from multiple sources within Slack by just typing
userinput.io - Get on-demand feedback for your app, website or idea. Learn how to improve by hearing real opinions.
Slack It - A bookmarklet to share links in Slack with one click
ithinki - A simple user feedback tool for start-ups