Sketch 101 by Designlab - Learn Sketch in this free course w/ downloadable templates
Vidrio - Holographic screencasting app for Mac. Free for COVID-19
The Design Thinking Workshop Kit - A free digital and print kit to help run your own workshop
Scrimba - Interactive coding screencasts created in an instant
Sketch Tricks - Articles for Sketch
GoRails - Ruby on Rails screencasts for Web Developers