Constellation

Puzzle-GIS   (Compare Project)

License: lgpl3

Mdweb 2   (Compare Project)

License: Unknown

MapFaces   (Compare Project)

License: lgpl3

GeotoolKit   (Compare Project)

License: lgpl21_or_later

ISM   (Compare Project)

Mostly written in JavaScript

License: mit

i3Geo   (Compare Project)

Mostly written in JavaScript

License: gpl

Fusion   (Compare Project)

License: mit

Heron Mapping Client   (Compare Project)

Mostly written in JavaScript

License: gpl3

OrbisGIS   (Compare Project)

Mostly written in Java

License: gpl3_or_later

OpenStreetMap   (Compare Project)

License: Unknown