The primary goal of the project is to provide web mapping applications with a complete library for processing and analyzing simple geometries but JSTS can also be used as a free standing geometry library.
JSTS was made using automatic translation of the original JTS Java source via AST to AST transformation preserving the JTS API.
An ES5 compatible build for browser use is available here.
A Google group is available for discussions.
Basic functionality is demonstrated in an example using OpenLayers 3.