For 'dumb' (not protocol aware) redirection you can just use iptables, it'll probably be much faster.

For protocol aware redirection, there are various reverse proxies with that ability. TCPMUX was probably one of the firsts, but it requires explicit support by the client. Delegate[1], on the other hand, can identify the protocol and multiplex based on that, IINM.

[1]: http://www.delegate.org/delegate/