- Circles are Awesome
 - Play with or learn about the "closed plane curve every point of which is equidistant from a fixed point within the curve", better known as a circle. - Conic Sections (5)
- Diamond Theory
- Symmetries of black-and-white tilings throw light on combinatorics and group theory.
- Erich's Packing Center
- Packing geometric shapes into other geometric shapes: circles in triangles, circles in circles, and much more, plus combinatorial geometry problems.
- Fractal Instances of the Traveling Salesman Problem
- Contains resources on the evolving field of the generation of instances of combinatorial optimisation problems with known optimal solution.
- Geometry Center
- Resources and reference materials from this mathematics research and education centre at the University of Minnesota.
- Geometry Formulas and Facts
- Excerpts from the 30th edition of CRC Standard Math Tables and Formulas covering geometry in two and three dimensions.
- Geometry in Action
- Explore various areas in which ideas from discrete and computational geometry meet real world applications.
- Geometry of the Sphere
- Provides basic information about spheres, looks at Girard's Theorem, and proves Euler's formula.
- Mathlab.com
- Java applet providing virtual straightedge and compass for online interactive geometry.
- Native American Geometry
- A physical, proportional geometry that originates from the simple circle. Art and mathematics seemlessly integrated in Nature's geometry, emphasizing multiple intelligences and multi-cultural instruction.
- Noncommutative Geometry
- Offers to the community of researchers in noncommutative geometry a centre of resources related to their work: listing job offers, conference announcements, and papers.
- Peek
- A programme to interactively visualise arbitrary n-dimension polytopes through the use of cross-sections and projections.
- Timeless by Design
- Dedicated to orthogons, simply space relationships repeated any direction within a work of art or design.
- Trisection of an Angle Unraveled
- A proposed solution to the ancient problem of geometrically trisecting an angle, pondered since the times of the ancient Greek mathematicians Pythagorus and Archimedes.
- Wallpaper Groups
- Plane symmetry groups.
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