Computer science central source for CFPs
Here are some other sites for multi-disciplinary CfP's  


PaperCrowd*
Research Bible
H-Net
Conferize
Conference Submit
OurGlocal
BrownWalker  
All Conference Alert
List of conference.org
All Conference Alerts
Conferensum


*Disclosure: I'm a co-founder at Ex Ordo and we built PaperCrowd as our contribution to the research community. It's restriced to academic research conferences and is free.