Can a router do proxypass?

I am currently using linux and apache to route external web traffic
that comes to my 1 IP to internal IPs of various web servers. I do
this using proxypass directive for apache:

http://httpd.apache.org/docs/mod/mod...html#proxypass

What I want to know is, are there other dumb devices that do this? I
don't want to purchase additioanl IPs and I'd like to have a device
with fewer moving parts that can do the same thing (e.g. a router or
firewall device).

Thanks,
Becker