Scratch mods & extensions:

• script vars - Real script variables in Scratch. Run on E羊icques
• local vars - Less pretty script vars, but including support for the TurboWarp compiler.
• anonymous lists - Temporary lists identified by number instead of name.
• some blocks - I think this was just a test :)
• Unnamed Scratch Mod - Doesn't have much right now, just script vars with a better interface and custom reporters.

Powder Toy scripts:

• Alchemistry - Several elements as they were understood in antiquity, as well as some transmutation reactions.
• Exotics - Bizarre particles and matter states, including tachyons (with time travel), negative mass and neutronium.
• Original tachyons - Superseded by tachyons in Exotics, but they function differently enough to include both.