5medias is a simple SOCKS5 (rfc) proxy.
It only supports TCP CONNECT commands, and static username/password authentication.
This authentication is only useful to prevent the most basic unauthorized access, but it is not really secure and it's extremely easy to sniff. Don't rely on it for real security.
5medias is written in Go, so to download and install the last version you can run:
go install blitiri.com.ar/go/5medias