Xorxes' morphology rules:
http://www.lojban.org/tiki/tiki-index.php?page=BPFK+Section%3A+PEG+Morphology+Algorithm&bl
Robin's PEG grammar and morphology rules:
http://www.digitalkingdom.org/~rlpowell/hobbies/lojban/grammar/index.html
http://www.digitalkingdom.org/~rlpowell/hobbies/lojban/grammar/lojban.peg.txt
http://www.digitalkingdom.org/~rlpowell/hobbies/lojban/grammar/lojban_morphology.peg.txt
John Leuner's PEG grammar is a combination of Robin's peg grammar and Xorxes' morphology rules:
http://subvert-the-dominant-paradigm.net/~lojban-dot/code/lojban_grammar.peg
Others ...