Build Your Own Blocks contains many features not available in Scratch (without editing the code). The features are that users can:
- Build their own blocks
- Host and join Mesh sessions
- Edit the elements of blocks
- Nestable sprites
- Compiler (makes a project into an .exe (application) file).
- Scrolling enhancements
- Undo (Scratch only contains "Undelete")
The BYOB guide can be found here.
BYOB can be downloaded here.
The alpha test for 3.0 can be found here.
Jens's first modification was "Chirp", a program that
had improvements in Scratch . He then began to work on BYOB (a much bigger project), which has two versions: 1.0 (for Scratch 1.3) and 2.0 (for Scratch 1.4). 3.0 is currently being worked on - a trailer can be found here, and the alpha test can be found here.