GIB
GIB is the game format used by the Korean Tygem server.
Software that can handle GIB files
Eric Backus made a perl script for converting .gib files into .sgf, available at http://alum.mit.edu/www/eric_backus/.
GokifuCom perl scripts for converting gib->sgf open sourced
https://github.com/bazilxp/gokifu
Interactive web page that converts gib to sgf. It also has a downloadable Ruby script:
gib2sgf.rb
(Credit to xed_over at lifein19x19.com for finding this. )