Conceptua Math
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Algebrus
Algebrus software along with the specially developed XPascal scientific programming language is rich on computational capabilities and has plenty of features that make any kind of calculations fast and easy. It could be as powerful as an expensive software for mathematical calculations or as simple as small "evaluate-while-type" expression calculator (in the compact console mode). And now it is FREE!

Relational
Relational an educational tool to provide a workspace for experimenting with relational algebra, an offshoot of first-order logic. It provides GUI that can be used for executing relational queries, and also provides a command line interface. Provides a standalone Python module that can be used for executing relational queries, parsing relational expressions and optimizing them. The UI now implements sessions and remembers where you left off the previous time.

Welcome to the Mathematics Assessment Project
News New – TRU Math: Teaching for Robust Understanding of Mathematics is a suite of tools for professional develompent and research - the alpha versions of these documents are available here… More International Awards for Team: Hugh Burkhardt and Malcolm Swan, leaders of the Shell Centre team, have been chosen by the International Commission on Mathematical instruction (ICMI) as the first recipients of the Emma Castelnuovo Medal for Excellence in the Practice of Mathematics Education. This complements the award by ICMI to Alan Schoenfeld of the 2011 Felix Klein Medal for Lifetime Achievement in research. Read more…

SpeedCrunch Portable
keyboard-oriented scientific calculator SpeedCrunch Portable is a keyboard-oriented scientific/algebraic calculator packaged as a portable app so you add up some quick sums or process advanced calculations wherever you go. You can place it on your USB flash drive, iPod, portable hard drive or a CD and use it on any computer, without leaving any personal information behind. Version 0.12 for Windows, Multilingual 9MB download / 27MB installed (Details)

GNU Octave
GNU Octave is a high-level interpreted language, primarily intended for numerical computations. It provides capabilities for the numerical solution of linear and nonlinear problems, and for performing other numerical experiments. It also provides extensive graphics capabilities for data visualization and manipulation. Octave is normally used through its interactive command line interface, but it can also be used to write non-interactive programs. The Octave language is quite similar to Matlab so that most programs are easily portable.

Factorization of Quadratic Expressions with Negative Coefficients ( Read )
What if you had a quadratic expression like or in which some or all the coefficients were negative? How could you factor that expression?
Graphing Calculator
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C.a.R. - News
Compass and Ruler - Construct and Rule C.a.R. simulates constructions with a pair of compasses and a ruler on a computer. By moving basic points, students can

Fun Kids Online Math Games
"Sheppard offers everything from early math to pre-algebra. The lessons include interactive activities to practice concepts. Students can shoot fruit, pop balloons, and even play math man (the math version of pac man!). Fractions, place value, money, and basic operations are some of the areas that are covered. Check it out at " --Shannon Jakeman , sjakeman.blogspot.com "Online math games, like the ones that you'll find for free at Sheppard Software, provide a valuable opportunity for children to learn a great deal while they're having fun.
Kig
Description Kig is a program for exploring geometric constructions. It is meant as a better replacement for such free programs as KGeo, KSeg and Dr. Geo and commercial programs like Cabri.

Gmsh: a three-dimensional finite element mesh generator with built-in pre- and post-processing facilities
Christophe Geuzaine and Jean-François Remacle Gmsh is a 3D finite element grid generator with a build-in CAD engine and post-processor. Its design goal is to provide a fast, light and user-friendly meshing tool with parametric input and advanced visualization capabilities.