Book List on Non-Euclidean Geometry - From theTreasureTroves collection.

Non-Euclidean Geometry - An introduction to Non-Euclidean Geometry written by Jacob Graves as an MSc project in 1997.

Non-Euclidean Geometry Links - Resources in non-Euclidean geometry.

Non-Euclidean Geometry by H.S.M. Coxeter - Classic text available from the MAA.

The Ontology and Cosmology of Non-Euclidean Geometry - A philosophical essay.

Non-Euclidean Geometry - A historical account with links to biographies of some of the people involved.

Seminar on the History of Hyperbolic Geometry - Seminar notes by Greg Schreiber.

Euclidean and Non-Euclidean Geometry with The Geometer's Sketchpad - Conference talk by Scott Steketee with downloadable sketches.

Non-Euclidean Geometry with LOGO - Review of a new version of LOGO developed at Cardiff.

Spherical Trigonometry, Arc Distance Formula - Finding the shortest distance between two points on the earth given latitude and longitude. Download ARC_CALC_3, Microsoft Excel version, A Spherical Triangle Calculator by James Q. Jacobs.

Non-Euclidean Geometry - Mathematics and the Liberal Arts - A resource for student research projects and for teachers interested in using the history of mathematics in their courses.

Smarandache Geometries - Having at least one smarandachely denied axiom: validated and invalidated; or invalidated in at least two distinct ways. Discussion groups and meetings.