BigBlueButton is a Web conferencing system that focuses on usability, modularity, and clean design, both for the user and developer. It implements real-time sharing of voice, Web cams, desktops, slides, and chat messages to provide remote students with a high-quality learning experience. Unlike other conferencing systems, the desktop sharing works on Mac OS X, Unix, and PC computers, and there is no hard-coded limit on the number of simultaneous Web cams.
Asterisk Presence Panel is a simple application that allows the user to monitor the status of extensions on multiple Asterisk based PBX systems. The application connects to the Asterisk server using the manager interface. When it starts, it uses a manager command to probe the status of the extension, after which it relies on the extension status messages in the manager session to update its status. The application features contact groups, the ability to click to dial a contact, computer driven dialling for any number, the ability to connect to multiple Asterisk servers, and integration with the system tray on supported platforms.
PlugPBX is a prebuilt, ARM-based Debian system for end users to run Asterisk and FreePBX on the Marvell SheevaPlug low power platform. It includes Asterisk 1.6.1 with compiled DAHDI kernel mods, FreePBX 2.5, Apache2, MySQL, Samba, Munin, Webmin, Avahai, and OpenSSH. It is built on top of Debian Squeeze.
The Taridium ipbx is a complete software-based VoIP PBX system that replaces a traditional proprietary hardware PBX. It runs on Linux without the need for extra software licenses, and is based on the SIP standard. It supports many phones and is available for free in a 5 user version.