ReactOS® is a free, modern operating system based on the design of Windows® XP/2003. Written completely from scratch, it aims to follow the Windows-NT® architecture designed by Microsoft from the hardware level right through to the application level. This is not a Linux based system, and shares none of the unix architecture.

to extract images from all kind of video filesavi, mpeg, wmv, mts and many others

Synfig Studio is a free and opensource animation software available for Windows, Linux and OSX.

"Because Mathematics can be so fun!K3DSurf is a program to visualize and manipulate Mathematical models in three, four, five and six dimensions. K3DSurf supports Parametric equations and Isosurfaces."

"Tired of debugging your regular expressions ? Do you want to quickly build efficient regexps ? Visual REGEXP is for you ! This software will let you design your regexps by letting you type the expression and visualize its effect on a sample of your choice."

"JavE is a free Ascii Editor. Rather than for editing texts, it is intended for drawing simple diagrams by using Ascii characters.It is like a graphics editor for editing texts instead of images."

Web conferencing that just works. Dimdim provides easy, open, affordable collaboration. Use for online meetings, eLearning, desktop sharing, training, distance education, unified collaboration, webinar, free web meetings and more.