ClayTek is a 3D games library based on SDL and OpenGL. It is being developed simultaneously with an Editor that uses FLTK, and is being developed under linux (Slack 9.0).
AltSci3D Manga Director is a open source editor for artists and developers of 3D manga/comics. Using Milkshape3D models and the pathing system, an artist can create a manga similar to Javantea's Fate.
Java Editor for 3D Scenes (espacially POVRay) based on Java and Java3D. It allows to create and manipulate 3D scenes as you could see it in commercial 3D editors like '3D Studio'.
grand8 is a rollercoaster simulator which offers the following features: a track editor using Bézier curves; realistic physical mouvements ; several camera placements; a 3D view (openGl)
VisTer is system for terrain and landscapes visualization. It is graphical scene editor with built-in java3d renderer, which may be used in your java3d application. VisTer is based on plug-in system, so you can easily develope and test our own algorithms