Block-IT! 

Convert 3D models into BLOCK format blocks for building 3D website environments in 3DML. Full version of Block-IT! features UV mapping, block optimisation for file size economy and a help file showing the basics of block creation via Metasequoia©
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WireFusion Professional 

WireFusion is a professional authoring tool for interactive plugin-free Web3D presentations. Flash is supported and can be combined with 3D models. Add-ons for MPEG video, MP3 sound, Zoom function and more are available.
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Panorama - Terrain Editor 

Panorama is a terrain or landscape editor, where beautiful landscapes are made easy. Landscapes can be created, painted, lightmapped and exported.
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