A collection of algorithms and data structures

The JTS Topology Suite is a Java library for creating and manipulating vector geometry.

A compact Android utility for constructing and drawing rounded regular polygons.

Processing Geometry Suite

坐标边界查询工具：使用jts库从省市区县乡镇边界数据或geojson边界数据文件中查找出和任意点、线、面有相交的矢量边界，提供HTTP API接口，内存占用低，性能优良（1秒可查1万个以上坐标对应的城市信息）

Official master repo (Git version)

An efficient, general-purpose mathematics components library in the Java programming language

A geometry model that conforms to the OGC Simple Features for SQL specification.

Oriedita (fork of Orihime) is an origami crease pattern editor and folding simulator.

vangav open source - backend; a backend generator (generates more than 90% of the code needed for big scale backend services)

Cellular Automata Simulator

Java port of Clipper2, a Polygon Clipping and Offsetting Library

Vector math, geometry, reference frame, and shapes 2D & 3D

OGC/GIS functions and extensions for Dremio

Commandline application for manipulating geometry.

Automatically exported from code.google.com/p/s2-geometry-library-java

PostGIS Java bindings

Simple Features Java Library

vangav open source - whatsapp; generated using vangav backend:

Produce grid geometries for statistics. As GIS vector datasets.