for
Cassian Mosha
Some links I like.
The Program of Mathematics Education
MacTutor History of Mathematics Site  St. Andrew's University
Math Forum (alias Geometry Forum)
Exponent Graphs

Exploring Parabolas

Assignment 3:Locus of a Point 
Centroids

GPS Scripts 
Triangle and Its Medians 
Tangent Circles 
Altitudes and Orthocenters 
Pedal Triangle 
Parametric Equations 
Polar Equations 
Spreadsheets 