The Waarp Gateway Kernel project is based on the Waarp Common project and propose Kernel elements for both FTP and HTTP Waarp's Gateways.
It is based mainly on the NETTY framework (NIO great framework support at http://netty.io and is tend to be really efficient, both in term of memory, threads and network bandwidth.
See global Waarp project at http://waarp.github.com/Waarp/ and particular Waarp Gateway Kernel project at http://github.com/WaarpGatewayKernel