Shape Tools creates geodesic shapes and includes a number of geodesic tools for QGIS including the XY to Line tool, geodesic densify tool, geodesic line break, geodesic measure tool, geodesic measurement layer, geodesic scale, rotate and translate tool, and digitize points at an azimuth & distance tools.

Unity3D GUI plugin to provides mesh optimization function by using UnityMeshSimplifier

Shape Tools creates geodesic shapes and includes a number of geodesic tools for QGIS including the XY to Line tool, geodesic densify tool, geodesic line break, geodesic measure tool, geodesic measurement layer, geodesic scale, rotate and translate tool, and digitize points at an azimuth & distance tools.

HTML app to move, add and delete GPX track points and lines, and split and join GPX track files

Blender add-on that reduces polygon count and texture size while preserving UV mapping — with optional pre-clean (merge by distance, Instant Clean)