PortTunnel

TCP/IP port redirector with many features for the advanced user.
Features:
- SMTP: antivirus (using existing installation of Sophos AV or Grisoft AVG)
- SMTP: relay filtering and AUTH
- FTP: translate 'PORT' and 'PASV' commands (FTP Bouncing)
- FTP: FTP over SSL/TLS
- Runs as a service on ALL versions of Windows
- Great for debugging network programs
- Can redirect many ports at once (including port ranges)
- TCP: IP security (and stealth ports on 2000/XP)
- TCP: SSL&TLS using OpenSSL
- TCP: tunnelling of connections through HTTP proxies
- TCP: speed limiting, data logging, etc
- TCP: passwording of tunnels
- SMTP: antispam (DNS/RBL & greylisting)
- Plus much more.