Free mathematical expressions software for windows

Fiirefox extension that offers developers functions for testing their regular expressions Regular Expressions Tester is a useful testing utility for regular expressions with color highlighting.
System requirements:
- Firefox: 1.5 ? 2.0.0

Mathmatix is an animated 2D and 3D expression graphing calculator. This application has been created to explore how to write software that interprets mathematical expressions written by a user.
Creating the expression parsing and calculation engines gave me a chance to use some of what I have learned from the compilers course that I have taken at Michigan State.
This project was also a good exercise in working with design patterns. One especially useful pattern incorporated into this application is the composite pattern. Mathmatix uses a composite made up of expression elements for storing, manipulating, and processing calculation trees.
Rendering speed and quality may vary greatly depending on what type of 3D-accelleration hardware you have installed on your system.

Formulator is a powerful interactive mathematical expressions editor. It uses WYSIWYG-style editing and allows creating mathematical equations through simple point-and-click techniques. Formulator is the intelligent software, aware of presentation or semantics face of mathematics. Advanced editing features are available by means of MathML authoring techniques which help Formulator to implement effective solutions for a wide audience of software developers, educators, students, STM publishers, etc. Among the distinguishing features of Formulator is component versions support (in the form of ActiveX Control or Automation Server) and extensive support of MathML 2.0 (Presentation, Content and Mixed markups) through easy-to-use graphical interface.
Exporting functionality of Formulator is extremely useful when a user wants to share you math documents. With the help of Formulator users have a freedom to publish their work in so different ways as MathML plain text fragments, XHTML documents with MathML inlined, raster images, vector graphics (EMF).
Formulator is visually oriented tool. It proposes intuitive and easy-to-use ways to create and edit both Presentation and Content MathML markups. Comprehensive collection of mathematical symbols and templates of Formulator is useful both to users having publishing needs and to those who is oriented on analysis of expressions meaning.
Field of applications for Formulator is really wide, since it comprises both a standalone application edition, run as a separate program, and a component edition, that is, an ActiveX control. When using the Formulator ActiveX Control this revolutionary functionality makes it simple to develop new software products, keenly aware of the mathematical typesetting and semantics rules. This helps to accelerate application development in computer-aided education, computer algebra systems, authoring tools, and many other applications for mathematics, science, business, economics, etc.

Desktop Expression application represents a free calculator designed to solve arithmetic expressions.
The expression calculator evaluates a single line artihmetic expression such as
sqrt(cos(60)+sin(30)).
Expression Calculator has been developed for Win32 platforms and has been tested with Windows XP.

The Hermitech MathML Expression Editor, known also as Formulator, is a dynamic and intelligent mathematical equation editor designed for personal computers running MS Windows 98/2000/XP. This application allows to create mathematical equations through simple point-and-click techniques.
Equations can be converted to/from Presentation, Content and Mixed Markups of MathML 2.0 and can be saved in several graphic file formats, ready to be imported into documents.
Formulator comprises both a standalone application edition, that can be run as a separate program, and a component edition, that is, an ActiveX Control (or Automation Server), that can be incorporated into any ActiveX container (or Active Document container).