Berkeley Logo (download manual as text) (download manual as PDF) (download readme) is a freeware interpreter that I wrote along with several students. (Major contributors are Daniel van Blerkom, Khang Dao, Michael Katz, Douglas Orleans, and Sanford Owings.) News! UCBLogo development has been taken over by wonderful chief volunteer Josh Cogliati and bunches of other volunteers: dmalec, Barak A. Pea