Filezilla is a free ftp client for windows mac os x and linux.
download top free software for windows mac os x and linux
Google Sketch Up is free 3d modelling tool for everyone. You can design your new home or office with this tool.
TeamViewer is a remote access software free for personal use. It is a great application for your pc or mac. It is available for windows linux mac os x iphone ipad and android phones and pdas. Teamviewer is a great solution for quick and easy access and remote support. It can be used without installation or can be installed as a system service which makes your computer accessible anytime from anywhere.
HJ Split is a freeware multi-platform file splitter software or a collection of it.
With HJ-Split tools you can split files into pieces and join them together on another platform.
It is usefull when you want to move a large file from one location to another.
Speed Crunch is a very fast and high precision calculator replacement for windows mac os x and linux,
SpeedCrunch supports 50 decimal points, syntax highlighting, unlimited variables, 50 built-in functions, history, smart completion…
for more features visit homepage of SpeedCrunch or visit downloads page to download for windows, mac os x or linux
VirtualBox is a powerfull open source virtual machine for x86 based systems, (which you can run windows on linux or vice versa)
It runs on most Mac Os X Windows Linux Solaris and OpenBSD.
VirtualBox supports many guest operating systems, here is the list :
http://www.virtualbox.org/wiki/Guest_OSes
I have tried it installing Pardus Linux that is not listed there and it worked well, (better than qemu)
I have also tried to install Leopard (Hackintosh) on it but i could only boot and it did not run further.
PeaZip is cross platform, available as portable and installable software for 32 and 64 bit Windows (9x, 2000, XP, Vista) and Linux (PeaZip is a desktop neutral application).
Neither WinZip nor WinRar are free but PeaZip is opensource free (gratis) software that every computer user needs for bussiness and home use.
can create archive formats : 7Z, ARC, BZ2, GZ, PAQ/LPAQ, PEA, QUAD/BALZ, TAR, UPX, ZIP;
can open archive formats : ACE, ARJ, CAB, CHM, COMPOUND (MSI, DOC, XLS, PPT), CPIO, ISO, Java (JAR, EAR, WAR), Linux (DEB, PET/PUP, RPM, SLP), LHA/LZH, LZMA, Mac (DMG/HFS), NSIS, Open Office files, PAK/PK3/PK4, RAR, SMZIP, U3P, UDF, WIM, XAR, XPI, Z/TZ.

Blender the free open source 3D content creation suite.
Blender is the free open source 3D content creation suite, available for all major operating systems under the GNU General Public License.
Blender is an alternative to very expensive animation softwares, for learning and bussiness purposes and to produce high level animations.
See it on comparison chart at http://www.tdt3d.be/articles_viewer.php?art_id=99
Tutorials : http://www.tutsbuzz.com/tutorials/blender3d.html

wireshark, the network protocol analyzer
Wireshark is the world’s foremost network protocol analyzer.
Wireshark has a rich feature set which includes the following: