Sipcat is a software IP telephony system that helps businesses increase productivity and reduce telecommunication costs. It allows you to start running your own voice over IP PBX in a matter of minutes. It contains a complete Linux distribution, including Asterisk and all required 3rd party software.
Terminal Mixer allows sharing the stdin/out/err of a process through a Unix socket, TCP, or raw ethernet (the latter only on Linux). It allows sharing a pseudo-terminal as well, for terminal-aware applications. The users can be allowed only to watch, or even to contribute. You can run your favourite 'vim' or 'bash' and access it remotely, even with multiple users using them.
JWebPresenter is a Web-based presenting system. It can add a Web extension to your favorite presentation tool, such as PowerPoint, MagicPoint, or Impress. This is useful in distance learning, meeting, conferencing, and other situations. It uses bitmap images to avoid compatibility problems. Other features include platform independence and simplicity.