Munin - Open Source Network Monitoring Tool

Munin is a network system monitoring application that presents output in graphs through a web interface. Its emphasis is on plug and play capabilities. About 500 monitoring plugins are currently available. Using Munin you can monitor the performance of your computers, networks, SANs, and applications. It tries to make it easy to determine "what's different today" when a performance problem crops up and to see how you're doing capacity wise on all limited resources.

It uses the RRDtool and is written in Perl. Munin has a master/node architecture in which the master connects to all the nodes at regular intervals and asks them for data. It then stores the data in RRD files, and (if needed) updates the graphs. One of the main goals has been ease of creating new plugins (graphs).

BigBlueButton- open source web conferencing software

BigBlueButton is open source web conferencing software. It is developed and is maintained by Blindside Networks. BigBlueButton uses red5, an open source implementation of Adobe's Flash Media Server, to support its real-time collaboration. It can be used for the purpose of business communications, formal discussion or any other of same purpose.

Ubuntu - Open Source Linux kernel based OS

Ubuntu Support Services

Ubuntu is a computer operating system based on the Debian Linux distribution and distributed as free and open source software, using its own desktop environment. Ubuntu is designed primarily for use on personal computers, although a server edition also exists. Ubuntu is sponsored by the UK-based company Canonical Ltd., owned by South African entrepreneur Mark Shuttleworth. Canonical generates revenue by selling technical support and services related to Ubuntu, while the operating system itself is entirely free of charge. The Ubuntu project is committed to the principles of free software development; people are encouraged to use free software, improve it, and pass it on.

Aciqura

Aciqra is a free and open source virtual planetarium and sky mapping program for simulating objects in the sky. It is intended for users who regularly view the sky through a telescope or binoculars, whether visually or with a camera, and need software to help them decide what to view and when.

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