Software

Software

Excel and Numbers
How to Copy HTML Tables to Microsoft Excel Penny a day lesson

Grapher
Grapher Tutorials

Open Source and Freeware Applications

Geogebra - is free and multi-platform dynamic mathematics software for learning and teaching. It has received several educational software awards in Europe and the USA.  
 * GeoGebraWiki is a free pool of educational materials for GeoGebra. Everyone can contribute and upload materials there.
 * [|GeoGebraForum] Still have questions? Use the GeoGebra Forum to get them answered.

Google Sketchup - is software that you can use to create 3D models of anything you like.