Anyone else remember using ResEdit on original Escape Velocity plugins? Probably my first introduction to hexadecimal as a kid, heh. Loved the game (and meta game of discovering how to tweak things myself) and excited to try this out.
If you want more flashbacks, I made an album of some recent attempts at classic Mac development: http://imgur.com/a/scNE2
Included are screenshots of ResEdit, Resourcerer, CodeWarrior, and more.