are there any programs i can download to help make my own mods?

[Totti]

can any one please tell me where i can get a program to help me make my own mods or anything like that?

[counterkiller]

go to www.gtareactor.de

[Shax-F]

GTAReactor server downloads are down

apart from here you can try these
look under Tools etc

http://www.zmodeler.com

http://www.codenamevice.co.uk

http://www.gta3mods.de

http://gta3.gamigo.de

http://www.gtanetwork.it