FaePetz - Archive of lost breeds from early Petz sites
Scrapyardz - Delvings into the inner workings of Petz
The Rat Shack - Interesting articles anf guides on Petz construction
Intron/Exon - Devoted to Petz genetics
LnzLive - Edit Lnz files in browser
PastyLabz - (Guide) Generate Lnz for paintballs.
Petz Old Web
VPZ Research Center - Personal favorite, a major inspiration