Engineering information & technology

IP Australia (fed govt).

IP Society of Australia & NZ

BrainSupply 

Cool License 

Delphion Intellectual Property Network

Globaltechnoscan 

HelloBrain

IP Marketplace 

Knexa 

Knowledge Express

Patent & License Exchange Inc.

PatentAuction

PatentPost

QX Health

TechEx

TechExchange Online

Yet2.com