VirtualBox is a family of powerful x86 virtualization products for enterprise as well as home use. Not only is VirtualBox an extremely feature rich, high performance product for enterprise customers, it is also the only professional solution that is freely available as Open Source Software under the terms of the GNU General Public License (GPL). See "About VirtualBox" for an introduction.
Synergy lets you easily share a single mouse and keyboard between multiple computers with different operating systems, each with its own display, without special hardware. It's intended for users with multiple computers on their desk since each system uses its own monitor(s).
Gobby is a free collaborative editor supporting multiple documents in one session and a multi-user chat. It runs on Microsoft Windows, Mac OS X, Linux and other Unix-like platforms.
PhotoRec is file data recovery software designed to recover lost files including video, documents and archives from Hard Disks and CDRom and lost pictures (thus, its 'Photo Recovery' name) from digital camera memory. PhotoRec ignores the filesystem and goes after the underlying data, so it will still work even if your media's filesystem has been severely damaged or re-formatted.
TestDisk ist ein leistungsstarkes freies Daten-Wiederherstellungs-Utility! Es wurde in erster Linie erstellt um verlorene Partitionen wiederherzustellen und/oder nicht bootende Festplatten wieder bootfähig zu machen, wenn das Problem durch fehlerhafte Software, bestimmte Arten von Viren oder menschliche Fehler (wie versehentliches Löschen der Partitionstabelle) verursacht wird. Partitionstabellen wiederherstellen mit TestDisk ist wirklich einfach.