The JTS Topology Suite is an API for modelling and manipulating 2-dimensional linear geometry. It provides numerous geometric predicates and functions. JTS conforms to the Simple Features Specification for SQL published by the Open GIS Consortium.
Sphaerica is an interactive spherical geometry computer software. You can create complex geometric constructions in spherical geometry with this software. It supports orthogonal, stereographic and gnomonic projections to display your construction. It also has a built in scripting language for automated constructions.
Geom4J is a computational geometry library for Java. It contains implementation of the most important computational geometry data structures and algorithms coded in pure Java, designed for ease of use and optimized for performance.
GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching geometry, algebra, statistics, and calculus. Download the free software at http://www.geogebra.org. Find the source code at http://www.geogebra.org/trac
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CaRMetal is a dynamic geometrysoftware : it provides to the teachers and pupils of primary , secondary school and university an environment which allows to investigate, in a interactive way, the geometrical properties of figures.
Geoplan-Geospace is a 2D and 3D interactive geometrysoftware to create and manipulate interactive figures for eLearning. It features euclidean geometry objects (lines, circles), numerical functions, numerical sequences, geometrical transformations.
The project Intergeo co-funded by the Community programme eContentplus develops an open-source library for the common file format it defines to allow developers of dynamic geometry systems to quickly integrate read support for such files.
This project seeks to develop tools for investigations into computational aspects of algebraic geometry over free groups. In particular, we are developing software implementations based on the theoretical work G. S. Makanin, A. Razborov, and others.
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JVisual3D is a GUI library, 3D geometry viewer and a mathematical visualization software written in pure java. It is comparable with the well known javaview project. This is under GPL. Create, manipulate and display easiely meshes, 3d shapes, surfaces,..