I work on three things currently.
Tube and Chill - https://tubeandchill.com
It's something like IMDB for YouTube with recommendations and browsability without algoritms.
Test Driving Rails - https://testdrivingrails.com
My new book on testing Rails with the default stack - Minitest and fixtures.
Business Class 2.0 - https://businessclasskit.com
A starter kit for Rails apps. I am now slowly working on 2.0.
If you have some comments, especially on Tube and Chill, I would appreciate them.