Plot 2d and 3d Graphs and Functions with GraphCalc

GraphCalc (Windows) is a great graphing tool that I had used along with CaR before I discovered GeoGebra.  It is capable of plotting 2-d graphs (up to 10 equations simultaneously) and 3d graphs (up to 6 equations simultaneously).  Unlike other graphing calculators, Graphcalc has numerous functionalities:  it allows adjustment of graph range and resolution, modification of tick marks, and graph and background color customization.  In addition, it also contains four rending modes and two shading models for a more flexible graph appearance.

3d graph plotted in GraphCalc

I recently checked GraphCalc’s latest version, and the new addition is that it allows finding the intersection of two functions as well as the drawing of tangent lines. Graphcalc also supports scripting  (haven’t tried this yet), particularly if and while operators.

And above all, GraphCalc is free.

8 Free Tools for Teachers from Microsoft

Microsoft has been doing its share recently in the free software category. Here are some of its free products and add-ons that maybe useful for teachers. 
  1. Interactive Classroom – lets teachers insert polling questions into PowerPoint presentations
  2. Microsoft Mathematics – a graphing calculator that plots in 2D and 3D, step-by-step equation solving, and useful tools to help students with math and science studies.
  3. Mouse Mischief –   a PowerPoint add-on that enables teachers to create and insert questions, polls, and drawing activity slides into PowerPoint lessons.
  4. Movie Maker (Windows Live) – creates movies and slide shows from photos and videos.
  5. Photostory – turns photos into digital slide shows.
  6. PhotoSynth – generates a three dimensional model of digital photos and a point cloud of a photographed object.
  7. Worldwide Telescope – enables your computer to function as a virtual telescope, bringing together imagery from the best ground and space-based telescopes in the world.
  8. SkyDrive – stores and shares files, and photos up to 5GB.