Springtomize - Tear down the walls
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
Five Icon Dock - Tweaks the dock of your jailbroken iPhone so that it can fit five icons instead of four.
PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?
Five Icon Switcher - This puts more icons into the iOS4 multitasking bar, instead of the usual four.
Komodia Relay - Free open source tool to perform TCP based session relay