3proxy : really tiny cross-platform proxy servers set ( http://3proxy.ru/ )
adzapper : Redirector for squid that intercepts advertising, page counters and some web bugs ( http://adzapper.sourceforge.net/ )
bfilter : An ad-filtering web proxy featuring an effective heuristic ad-detection algorithm ( http://bfilter.sourceforge.net/ )
c-icap : C Implementation of an ICAP server ( http://c-icap.sourceforge.net/ )
c-icap-modules : URL blocklist and virus scanner for the C-ICAP server ( http://c-icap.sourceforge.net/ )
cntlm : Cntlm is an NTLM/NTLMv2 authenticating HTTP proxy ( http://cntlm.sourceforge.net/ )
dansguardian : Web content filtering via proxy ( http://www.dansguardian.org )
dante : A free socks4,5 and msproxy implementation ( http://www.inet.no/dante/ )
dnsproxy : The dnsproxy daemon is a proxy for DNS queries ( http://www.wolfermann.org/dnsproxy.html )
haproxy : A TCP/HTTP reverse proxy for high availability environments ( http://haproxy.1wt.eu )
hatop : interactive ncurses client and real-time monitoring ( http://feurix.org/projects/hatop/ )
havp : HTTP AntiVirus Proxy ( http://www.server-side.de/ )
http-replicator : Proxy cache for Gentoo packages ( http://sourceforge.net/projects/http-replicator )
httpush : Httpush is an intercepting proxy, allowing user to modify HTTP requests on-the-fly ( http://httpush.sourceforge.net/ )
mitmproxy : An interactive, SSL-capable, man-in-the-middle HTTP proxy ( http://mitmproxy.org/ )
ntlmaps : NTLM proxy Authentication against MS proxy/web server ( http://ntlmaps.sourceforge.net/ )
nutcracker : A fast, light-weight proxy for Memcached and Redis ( https://github.com/twitter/twemproxy )
nylon : A lightweight SOCKS proxy server ( http://monkey.org/~marius/nylon/ )
obfsproxy : An obfuscating proxy using Tor's pluggable transport protocol ( https://www.torproject.org/projects/obfsproxy.html )
oops : An advanced multithreaded caching web proxy ( http://zipper.paco.net/~igor/oops.eng/ )
pingtunnel : Tunnel TCP over ICMP ( http://www.cs.uit.no/~daniels/PingTunnel )
piper : Piper (a tool for manipulating SOCKS5 servers) ( http://www.qwirx.com/ )
polipo : A caching web proxy ( http://www.pps.jussieu.fr/~jch/software/polipo/ )
privoxy : A web proxy with advanced filtering capabilities for protecting privacy against Internet junk ( http://www.privoxy.org http://sourceforge.net/projects/ijbswa/ )
ratproxy : A semi-automated, largely passive web application security audit tool ( https://code.google.com/p/ratproxy/ )
rejik : A squid redirector used for blocking unwanted content ( http://rejik.ru/ )
shadowsocks-libev : A lightweight secured scoks5 proxy for embedded devices and low end boxes ( https://github.com/shadowsocks/shadowsocks-libev )
squid : A full-featured web proxy cache ( http://www.squid-cache.org/ )
squidclamav : HTTP Antivirus for Squid based on ClamAv and ICAP ( http://squidclamav.darold.net/ )
squidguard : Combined filter, redirector and access controller plugin for Squid ( http://www.squidguard.org )
squirm : A redirector for Squid ( http://squirm.foote.com.au )
sshproxy : sshproxy is an ssh gateway to apply ACLs on ssh connections ( http://sshproxy-project.org/ )
sshuttle : Transparent proxy server that works as a poor man's VPN using ssh ( https://github.com/apenwarr/sshuttle/ )
tayga : out-of-kernel stateless NAT64 implementation based on TUN ( http://www.litech.org/tayga/ )
tinyproxy : A lightweight HTTP/SSL proxy ( http://www.banu.com/tinyproxy/ )
torsocks : Use most socks-friendly applications with Tor ( https://github.com/dgoulet/torsocks )
tsocks : Transparent SOCKS v4 proxying library ( http://tsocks.sourceforge.net/ )
ufdbguard : ufdbGuard is a redirector for the Squid internet proxy ( http://www.urlfilterdb.com/en/products/ufdbguard.html )
webscarab : A framework for analysing applications that communicate using the HTTP and HTTPS protocols ( https://www.owasp.org/index.php/Webscarab )
wwwoffle : Web caching proxy suitable for non-permanent Internet connections ( http://www.gedanken.org.uk/software/wwwoffle/ )
ziproxy : A forwarding, non-caching, compressing web proxy server ( http://ziproxy.sourceforge.net/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a gentoo
For Paludis use this rsync : rsync://gentoo.zugaina.org/gentoo-portage
If you have a problem : ycarus(-at-)zugaina.org