VRML

BS Workflow Tools
A wide variety of tools to edit, optimize, reduce, and perform other functions on VRML models. Also available as an SDK.
http://www.bitmanagement.com/products/bs_tools.en.html

Chisel
A Java-based VRML optimization tool. Chisel can be installed on multiple platforms.
http://create.ife.no/vr/tools/chisel/

Flux Studio
Modeling and animation application for creating real-time Web 3D content and virtual worlds. MS Windows XP and Vista versions.
http://www.mediamachines.com/developer.php

Seamless3d
Free open source 3d modeling software for animated content for the web. Export and import VRML files.
http://www.seamless3d.com/

SwirlX3D Editor
A visual authoring system for VRML which provides full VRML editing with the ease of use of a graphical environment.
http://www.pinecoast.com/

TriVista Technologies
3D ImageScene and 3D ImageCube tools for displaying photographs. Free trial versions available. [Microsoft Windows]
http://www.trivista.com/

Vitruvian Studio
A tool to generate interactive walkthroughs from VRML generated by ArchiCAD.
http://www.vitruvian-studio.com

VizUp
Optimize 3D models with polygon reduction tools. Supports VRML and other 3D formats.
http://www.vizup.com/

VRMLpad
A professional editor for VRML programming. Licensing is available.
http://www.parallelgraphics.com/products/vrmlpad/

White Dune
White Dune is a low level VRML tool that can read VRML files, display and let the user change the scenegraph and fields.
http://vrml.cip.ica.uni-stuttgart.de/dune/