Revit Extensions extend the capabilities of Autodesk Revit.
Design 2D and 3D models for architectural design or structural engineering.
The Graphisoft ArchiCAD Connection is a an add-in for Autodesk Revit programs.
Barrington Architecture & Design Ltd.
It allows you to browse and place families from a curated Revit version.
the GPU Development Team
GPU is a Gnutella client that allows users to share CPU-resources.
Lets you add add architectural entourage to your BIM projects and renderings.
Export a 3D view from Autodesk Revit Architecture 2011/2012 to a EPix file.
It provides bidirectional integration with Revit Architecture and Structure.
AGA CAD Ltd.
The extenstion to import MS Excel spreadsheets to Autodesk Revit Architecture.
MagicSoft CG has a GPU-based rendering engine that supports all SD and HD modes.
Advanced GPU & CPU photo-realistic rendering suite.
Render Plus Systems, Inc.
Photo Realistic renderings from Revit with a new integrated rendering Engine.
Enscape is a realtime rendering plugin for Autodesk Revit.