Filezilla is a free ftp client for windows mac os x and linux.
download top free software for windows mac os x and linux
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.
7zip is a file archiver with a high compression ratio. 7zip has its own format 7z and supports many formats like zip rar cab iso etc..
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.

Pencil Animaton
Pencil is an animation software which you can create classic animations in 2d like cartoons and export it as movie or flash,
With Pencil you can create flash banners or flash animations in swf format for free,
Pencil is an opensource free software for windows mac os x and linux…
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.