NetCut - NetCut is a Software that helps you admin your network by purely on ARP protocol.
socat - socat is a relay for bidirectional data transfer between two independent data channels.
SelfishNet - Block anyone or any device from using your internet
Komodia Relay - Free open source tool to perform TCP based session relay
WifiKill - App with ability to block other devices from network
Simple Port Forwarding - Simple Port Forwarding works with WebPages and not directly with your router.