AppGate Security Server is an access control gateway for secure access to resources such as TCP ports, network ranges, Web pages, file shares, and remote desktops. Users connect with the cross-platform AppGate client (or any standard SSH client) and the server has a detailed configuration that says which users gain access to what under which circumstances. AppGate Free Edition is a virtual appliance running in a VMWare image and is limited to a maximum of 10 concurrent users.
MindTerm is a complete ssh-client in pure Java. It can be used either as a standalone Java application or as a Java applet. Three packages of importance are provided (terminal, ssh, and security). The terminal package is a rather complete vt102/xterm-terminal, and the ssh-package contains the ssh- protocol and also "drop-in" socket replacements to use ssh-tunnels transparently from a Java application/applet. It also contains functionality to realize a ssh-server. Finally, the security package contains RSA, DES, 3DES, Blowfish, IDEA, and RC4 ciphers.
TkRat is a graphical Mail User Agent (MUA) which handles MIME. It is mainly written in C, but the user interface is done in Tcl/Tk. The program currently understands UNIX mailboxes, POP, IMAP, and mh folders. Messages are sent via SMTP or any user configured program (sendmail, for example). It has support for disconnected IMAP operations.