Use different color for extensions and custom blocks · Issue #1336 · scratchfoundation/scratch-blocks · GitHub

Make the color of the block a comment is attached to more

Blocks in Echo of the Light - prototype do not show up · Issue

Replace scratchblocks with s3blocks · Issue #2726

Allow custom blocks to be shaped like C blocks (if, repeat

Repeat block treats its argument differently than in Scratch 2.0

How To Customize Blocks In Scratch: An Easy Guide - BrightChamps Blog

Comments attached to custom block definitions in 2.0 do not attach

Replace scratchblocks with s3blocks · Issue #2726

Scratch Programming: What Are Code Blocks?

Addons - Scratch Addons

Implement Define blocks · Issue #1102 · scratchfoundation

Hacked Blocks - Support Argument Hacking · Issue #1030