I have come across these exchanges at various places and they say powered by betfair. The market liquidity correspond exactly with Betfair (taking into account currency difference) and they are fully interlinked. They also have extra markets in cricket like Runs over/under as compared to Betfair.
Sky Exchange:
https://www.skyexchange.com/exchange/member/index.jsp
LC Exchange:
https://www.lcexch.com/Login#
Any one have any experience with these?
New Exchanges powered by Betfair
Pretty sure I've seen similar ones which you can only access with Asian brokers so jukebox is correct I believe
Same market I think (odds and liquidity) and you can get trading software