Java·Applied·Geodesy·3D (JAG3D) is one of the most popular open source least-squares software package for geodetic sciences. The Java-based application is distributed under the terms of the GNU ...
Basic 3D support is available starting from version 11.13. The first 3D game demo tutorial uses 11.15 and is on YouTube. This page provides some general tips related to using 3D in FXGL.