Do this on your own risk.

This is tools for iphone 3G
If u own a iphone 3G and want to unlock it and jailbreak it in same time then use pwnagetool and make custom firmwire and then use itunes, but if u dont want to unlock your iphone and just want jailbreak it then use quickpwn or pwnagetool.

Google is your friend, so check it out if u are not 100% sure

• PhoneView 2.1.1 Full
• Beginning iPhone Development
• ImTOO iPod Computer Transfer 2.1.33.0505
• TouchCopy v3.25
• iPhoneVideo Converter
• XBox 360 Hack Pack
• Eztoo DVD To iPhone/AVI/FLV/MKV/WMV/Ipod/MP3/MP4/MPEG Converter 2.00
• 4U Download YouTube Video 2.1.6
• Convert all video files to 3gp,mp4,psp,iPod,iPhone,flv,dvd
• Corel Video Studio Pro X2 v12.0.98.0 + Keygen + Patch