Just a few that come in my mind right now:
Asus: www.asus.com
Abit: www.abit.com.tw
QDI: www.qdigrp.com
Soyo: www.soyo.com.tw
MSI : www.msi.com.tw
EliteGroup: www.ecs.com.tw
EpoX: www.epox.com.tw
hmm thats about it. i will be back if I remeber anything else:-)
If someone else has problems with a bad flash in an older motherboard out of guarantee, he / she can purchase the RD1 BIOS Savior which can save you from a lot of trouble :)
Oh and here's the link
http://www.ioss.com.tw/eg/