From the site:

Pegasus Mail is a free, standards-based electronic mail client suitable for use by single or multiple users on single computers or on local area networks. A proven product, it has served millions of users since it was released in 1990. It is extremely feature-rich and powerful, yet remains small and fast.

Mercury is a free, standards-based mail server solution, providing comprehensive, fast server support for all major Internet e-mail protocols. It is supplied in two versions, one hosted on Windows systems, the other running as a set of NLMs on Novell NetWare file servers.

A Fast, Powerful, Reliable & Secure FTP server!

- Low on resources
- High transfer speed
- Remote administration
- Virtual file system
- System service support
- Strong SSL/TLS
- IP access management
- Anti-Hammering
- Multiple and complex group memberships
- Advanced passive mode

From author's site:

Open Source fast FTP client for Windows with a lot of features. Perhaps the best free FTP program available. Among others, the features of FileZilla include the following:

- Easy to use
- Supports FTP, FTP over SSL/TLS (FTPS) and SSH File Transfer Protocol (SFTP)
- Cross-platform. Runs on Windows, Linux, *BSD, OSX and more
- Available in many languages
- Supports resume and transfer of large files >4GB
- Powerful Site Manager and transfer queue
- Drag & drop support
- Configurable Speed limits
- Filename filters
- Network configuration wizard

PostCast Server completely replaces your ISP's SMTP server. By simply changing the address of the SMTP server or the Outgoing Mail Server, as specified in some e-mail programs you are able to send messages directly from your computer to the recipient of every message you send.

1. Simultaneously delivers up to 50 messages
   
2. Maximum flexibility in the sending process
   
3. Increased privacy of messages
   
4. Faster message delivery
   
5. No dependence on the availability of your ISP's server

Turbocharged VNC! UltraVNC key features include File Transfer, Video Driver, Encryption Plugins, MS Logon, high performances over all kinds of connections, Viewer Toolbar, JavaViewer with FileTransfer, autoscaling and serverside scaling, Multiple Monitors support, Repeater/proxy support, good Security and Text Chat.