In MatematicasVisuales we try to see mathematical concepts. If you want to learn more about the ideas involved you can find useful information in
It is a very big site about mathematics with visualization applications made using Mathematica.
The web site 'Cátedra UCM Miguel de Guzmán' has a lot of information about Miguel de Guzmán.
More applets:
Web site with a lot of pages and interactive applications about Mathematics developed by Alexander Bogomolny.
Excellent mathlets using GeoGebra.
Applets Java of Mathematics Walter Fendt
Math Education and Technology - IES International Education Software
Videos and mathematical animations:
Cristóbal Vila, etérea estudios
Cristóbal Vila is an Spanish designer. He is producing spectacular 3D movies. He uses a lot of mathematics in his work and we can not miss them.
For example, Inspirations,
based on Escher's works, or
Nature by Numbers.
Complex functions:
Tristan Needham - Visual Complex Analysis.
A wonderful book.
Frank Farris - Visualizing complex-valued functions in the plane
Farris introduces a new way to use color in visualizing complex-valued functions in the plane.
He has a very famous video about Moebius functions: Möbius Transformations Revealed.
Convergence: Where Mathematics, History, and Teaching Interact.
Convergence is the Mathematical Association of America free online journal about the history of mathematics and its use in teaching.