Scribus is an open-source program that brings award-winning professional page layout to Linux/Unix, MacOS X, OS/2 and Windows desktops with a combination of "press-ready" output and new approaches to page layout. Underneath the modern and user friendly interface, Scribus supports professional publishing features, such as CMYK color, separations, ICC color management and versatile PDF creation.

Free open-source disk encryption software for Windows Vista/XP, Mac OS X, and Linux

XML & XML Schema editor and XSLT debugger. EditiX also includes a CSS editor. (Windows, Mac OS X & Linux; free version available for non-commercial use)

The PosteRazor cuts a raster image into pieces which can afterwards be printed out and assembled to a poster.

Portable Windows Media streaming client with a footprint of 368K. It lets you download, store and manage files in .WMV, .WMA, .WMX and many other rich media formats. You can use it with Windows or Linux.

Opcion Font Viewer is a Java based font viewer that allows you to view (un)installed TrueType fonts one or many at a time.

Presently, VirtualBox runs on Windows, Linux, Macintosh and OpenSolaris hosts and supports a large number of guest operating systems including but not limited to Windows (NT 4.0, 2000, XP, Server 2003, Vista), DOS/Windows 3.x, Linux (2.4 and 2.6), Solaris and OpenSolaris, and OpenBSD.

Pidgin is an easy to use and free chat client used by millions. Connect to AIM, MSN, Yahoo, and more chat networks all at once. Supported chat networks: AIMBonjourGadu-GaduGoogle TalkGroupwiseICQIRCMSNMySpaceIMQQSILCSIMPLESametimeXMPPYahoo!Zephyr

Komodo Edit is a free, open source editor from dynamic language experts. It's absolutely fantastic to work with. It does everything a good editor should do, but it also adds a bunch of other little awesome things." -Dan Hulton, www.danhulton.com * All the languages: Dynamic language expertise for Perl, PHP, Python, Ruby, and Tcl, plus JavaScript, CSS, HTML, and XML, and template languages like RHTML, Template-Toolkit, HTML-Smarty and Django. * All the platforms: Windows? Mac? Linux? Yes! Yes! Yes! * Award-wining tools: Everything you'd expect from an editor based on the award-winning Komodo IDE, like autocomplete and calltips, multi-language file support, syntax coloring and syntax checking, Vi emulation, Emacs key bindings, and more. * Firefox-style extensibility: Go ahead, hack away! Or download some of the cool extensions from member of the Komodo community.

I was thinking of getting one tower, put 3 hard disks - one for each system... and maybe several graphic cards and so on?
Has anyone something like that?
Have any advice?