if you want a list of the biggest TGPs accepting submissions:
http://www.tgpstats.com
Free submission software:
http://www.freetgpsubmitter.com
Paid submission software:
http://www.darksoftcomputers.com/gass/
http://www.worldadult.com/tgsw/
http://tgp.russiansubmitter.com/
Please note that using automatic submitters will get you banned in some places.