NonEuclidian Java Software "NonEuclid is Java Software for Interactively Creating Ruler and Compass Constructions in both the Poincaré Disk and the Upper Half-Plane Models of Hyperbolic Geometry for use in High School and Undergraduate Education. Hyperbolic Geometry is a geometry of Einstein's General Theory of Relativity and Curved Hyperspace." The software can be run online or downloaded as a .zip file. There is a primer of basic concepts: What is Non-Euclidean Geometry l The Shape of Space l The Pseudosphere l Parallel Lines l Axioms and Theorems l Area l X-Y Coordinate System l Disk and Upper Half-Plane Models. There is also a section "For The Teacher: Why is it Important for Students to Study Hyperbolic Geometry?"