A simple way to block access to the internet per app
Manage port forwardings via UPnP
USB Bridge for SMBus/I2C, GPIO, & Clock
A GUI interface written "Around" LuaMacros
Java SSH API
Port forwarding between TCP and UDP
The Java NIO based TCP port mapper
NetKitty is a GUI for Netcat
Lomalarga is a VPN-like service based on SSH and Linux.