Pretty easy to use gem to build Slack layouts using BlockKit.

Sending messages with the Slack API is not that difficult, but I've had to solve the same problems a lot of times at different companies. This gem attempts to make those solutions irrelevant by providing a simple interface and scripts to send and update messages, and build/extend threads.

Zirp is a comprehensive tool for creating and distributing product release notes with video demos and multi-channel notifications (Slack, Email, Twitter, LinkedIn)