PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?
Springtomize - Tear down the walls
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
Cylinder - Sexy homescreen icon animations
Komodia Relay - Free open source tool to perform TCP based session relay
SwitcherMod - SwitcherMod lets you customize the iOS4 multitasking bar.