Here you can find various scripts for creating symbols written by many people
using their own favorite languages:
— the most known symbol generator by Werner Hoch
— the symbol generator by DJ Delorie
— an improved gmk_sym utility which predecessor originally written by Jerry O'Keefe
is included in the gEDA suite.
– BXL → gEDA symbol / PCB footprint converter by Erich Heinzle
, users with vendor supplied BXL files are encouraged to try it.