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Find open source software alternatives to well-known commercial software

GeoGebra is a free and multi-platform dynamic mathematics software for schools that joins geometry, algebra and calculus. It received several international awards including the European and German educational software awards.

CoFFEE is complemented by pedagogical scenarii - customisable lesson plans that are written by the projects researchers. These scenarii offer a good starting point for teachers who want to start using CoFFEE. They include both files that teachers can plug into CoFFEE to run a lesson plan, as well as a written step-by-step lesson plan instructing the teacher on all the relevant aspects of running a CoFFEE supported classroom activity.

GIMPshop is a modification of the free/open source GNU Image Manipulation Program (GIMP), intended to replicate the feel of Adobe Photoshop. Its primary purpose is to make users of Photoshop feel comfortable using GIMP.

Stellarium is a free open source planetarium for your computer. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope. It is being used in planetarium projectors. Just set your coordinates and go.

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.

A great list of open source alternatives for expensive applications.