I found 2 myself already , but I still want to know of any others to try out.
BGB Lets you play linkup through TCP/IP
GEST Lets you play 2 diff roms in the one emu on one PC with a dual screen thing going on
NO$GMB Seems to crash alot for me, with the roms I have tested
TGB Dual Dual screens again, compatabilty for dual games seems better than GEST aswell. - thanks go to Nightingale for this one (Get that one at Zophar's for the english version)
If any of you know of any others I would be very greatfull if you could share them, and link them here.
Edit added NO$GMB but seems to crash