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GeoGebra is a dynamic mathematics software for schools that joins geometry, algebra and calculus.
Desmos Graph functions, plot tables of data, evaluate equations, explore transformations, and much more for free!

On the one hand, GeoGebra and Desmos are interactive geometry systems. You can do constructions with points, vectors, segments, lines, conic sections as well as functions and change them dynamically afterwards. On the other hand, equations and coordinates can be entered directly.

GeoGebra can be downloaded for free and you do not need to obtain administration rights - To access the website and download the software - I suggest you go to CNET - Click here

Desmos can be accessed online  - Click here

Both environments have lots of free resources already produced by teachers

Geogebra - www.geogebra.org
Dynamic geometry, algebra and calculus package.
Geogebra Resources - Click here
Free pool of dynamic worksheets developed by teachers - Best of in centre column.
GeoGebraForum - www.geogebra.org/forum
Supportive and enthusiastic user community.
International GeoGebra Institute - www.geogebra.org/IGI
Offers free training for teachers
Issues GeoGebra certification
Conducts reasearch.
UK Contact: Zsolt Lavicza - zsolt@geogebra.org  

Resources
: Warning: Select the Save Option and then extract the files.  You may find it necessary to open the GeoGebra program and then open the file from the top menu rather than double clicking the file to open it

The following were produced by Kevin Brinkley, Mark Dawes, Charlie Dawson, Mark Greenaway, Jack Keeler, Zsolt Lavicza and Matt Sims.

For an overview of the toolbar used in GeoGebra - Click here

Tutorial Files - These comprise a PowerPoint Tutorial enabling teacher or student to generate a GeoGebra file - [they were produced thanks to partnership funding provided by Suffolk Advisory Service as were many of the ready to use files]
 
Circle Theorems Enlargement Rotation Reflection
Equations of Lines Loci Mixed Transformations Transformation of Curves
Reflectional Symmetry      

Files Ready to Use - These comprise GeoGebra files that can be used in the classroom in their present format
 

Number
Multiplying Fractions  

 

 
       
Algebra
Optimisation.doc
Optimisation Solution
Speed-Time Graph Distance-Time Graph Equation of a Circle
Numerical Integration Perpendicular Lines Simultaneous Equations
Linear & Quadratic
Gradient
       
Shape
Angle Rules    
Alternate Angles Angles around a Point Corresponding Angles Interior Angles
Exterior Angles in a Triangle Exterior Angles in a Square Exterior Angles in a Pentagon Exterior Angles in a Polygon
Angles on a Straight Line      
       
Circle Theorems    
Circle Theorem 1 Circle Theorem 2 Circle Theorem 3 Circle Theorem 4
Circle Theorem 5 Circle Theorem 6 Circle Theorem 7 Intersecting Chord Lengths (Inside)
       
Area & Pythagoras    
Area of a Rectangle Area of a Kite Area of a Triangle Area of a Trapezium
Tilted Square Pythagoras    
       
Reflectional Symmetry    
Reflection Face Reflection Man 1 Reflection Man 2  
       
Transformations    
Reflections Translations Rotation  
       
Geometry    
Bisecting Sides of a Triangle Midpoint of a Line Midpoints of Sides of Quadrilaterals What is the Shape