Собственно сабж:
http://ssspl.sourceforge.net/

Install:

wget http://ssspl.svn.sourceforge.net/viewvc/ssspl/sss.pl
chmod 755 sss.pl

Usage:

./sss.pl local_host local_port [auth_login(:auth_pass)]

Настройка Opera под Socks5:
http://jponiato.hubpages.com/hub/How-to-Use-Opera-with-a-SOCKS-Proxy#