Transport-layer distributed reverse/forward proxy and tunneling solution.
 PortFusion is a minimalistic, cross-platform, transport-layer distributed
 reverse / forward proxy and tunneling solution for TCP released
 under GPLv3.  A single package that makes the most of each platform by
 tapping into their unique capabilities, combining this power with an
 intuitive interface, beautiful design and Haskell's excellent support
 for unprecedented levels of concurrency and parallelism.  It strives
 for the smallest source code size while delivering maximum throughput
 with near-zero overhead.