ZGRViewer is a 2.5D graph visualizer implemented in Java and based upon the Zoomable Visual Transformation Machine. It is specifically aimed at displaying graphs expressed using the DOT language from AT&T GraphViz and processed by programs dot, neato or others such as twopi.
The Network Protocol sniffer formerly known as Ethereal. Live capture tool allows offline analysis ad can read data from ethernet, bluetooth, usb, etc ... and supports every protocol I can think of.
Orange is a component-based data mining software. It includes a range of preprocessing, modelling and data exploration techniques. It is based on C++ components, that are accessed either directly (not very common), through Python scripts (easier and better), or through GUI objects called Orange Widgets.
Bochs is a highly portable open source x86 PC emulator ... capable of running most Operating Systems inside the emulation including Linux, DOS, and all versions of Windows... and the images are portable from one host OS to another.
Kaltura Community Edition is a self-hosted, community supported version of Kaltura's Open Source Online Video Platform. Following installation any site can gain comprehensive video and rich media functionalities including video management, searching, uploading, importing, editing, annotating, remixing and sharing. It is intended to solve all your video-related needs, and allow you to easily create your own rich-media applications - all behind your own firewall and on your own servers.