Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
Lurchr - Saves all your Slack links, so you can focus on work
Google Drive to Slack - Slack notifications whenever you work on Google Drive docs
Slack It - A bookmarklet to share links in Slack with one click
Paperbot (Reloaded) - Slack meets Pocket
Airtable-to-PostgreSQL Migration Tool - A totally free migration tool.