'Other' Modelers
Collection of assorted stuff...
Some 'Other' Programs
AC3D 3DS, OBJ and Collada formats, and more. Fee - Windows, Mac, Linux
3ds Max Fee - Windows
Archipelis Designer Create 3D models from 2D images. Fee - Windows, Mac
Anim8or Subdivision modeler - Free
Blender Open-Source - Model, shade, animate, render, Macromedia exporter
Boats
Delftship Hull program - Free and Fee
Hull Design Hull program - Free
DAZ 3D Modeling/rendering
Dilay An open-source 3D sculpting application. Windows, Linux
gSculpt open source, procedural subdivision modeler
hamaPatch Free nurbs modeler. Website disappeared, but a program copy lives here. - Windows
Helix Converts SketchUp®, AutoCAD®, and Rhino® models to native Revit® components and vice-versa via a plugin.
MakeHuman Open source. Windows, Mac, Linux
MarbleCLAY 3D polygon modeler. Japanese, English. Free - Windows
Membranes24 Online tensile structure program which makes DXF files.
Metasequoia Polygon modeler for 3DCG and game development. Japanese, English. Free, Fee - Windows
MoI N-Gon polygon meshes. Fee - Windows, Mac
Quidam 3D character creator - Fee - Windows, Mac
Rhino Fee - Windows, Mac
Rheingold3D 3D modeling saved to many formats, multilingual. - small Fee - Windows
Scupltris Pixologic, ZBrush developer, digital sculpting. Free - Windows, Mac
ShapeShop 3D meshes, exports in OBJ, STL and Collada. - Free - Windows, TabletPCs
SmoothTeddy Simple 3D modeler. Free - Windows
Vectary Online, 3D modeler.
Vue Create, animate and render natural 3D environments. Fee - Windows, Mac
Wings 3D Subdivision modeler. Free - Mac, Windows, Linux
CAD
2D Tools TIG - SketchUp plugin
Alibre Design 2D/3D parametric - old add-on for SketchUp that still works in version 12. Fee - Windows
AllyCAD Free and Fee
Ashampoo 3D CAD Architecture German, English - Fee - Windows
ArchiCAD Google Earth, SketchUp and 3D Warehouse integration (install the latest maintenance patch.)
AutoCAD OK, most everyone know about this program, but they have a free viewer for desktop, web and mobile that can convert DWG files into other format versions to improve importation options into other programs. Look for "DWG, The Original" link on the homepage.
Autodesk Navisworks Reads SKP and many other formats
Plexscape Mosiac maker using Google Earth imagery.
Revit Architecture 2008 The Building Maker feature allows SKP import as mass objects.
Bricscad 2D/3D via IntelliCAD engine. Fee - Windows, Linux
CadStd 2D CAD - Free and Fee - v3.7.3 Pro and Lite indroduced DAE export (imports directly into SketchUp)
Creation Engine Sells student software packages
DataCAD Exports SketchUp 7 and 8, insert SKP as a symbol or as XRef in subscription version. Free, Fee - Windows
DoubleCAD Imports SKP and integrated 3D Warehouse access. Free - Fee - Windows
DraftSight 2D CAD - Free and Fee - Windows , Mac, Linux
HighDesign 2D CAD - Fee - Mac
LandF/X Landscape in SketchUp from AutoCAD plans. SketchUp extension
LinuxCAD 2D/3D - Fee - Windows, Mac, Linux
MicroGDS 2D and 3D CAD, imports SKP. From Informatix, the makers of Piranesi - Fee - Windows
ProgeCAD 2D/3D via IntelliCAD engine
PunchCAD 2D/3D modeling products - Modest Fee - Exports to common CAD formats IGES, STEP, SAT, and STL:
QCad 2D - Multilingual - Windows, Mac, Linux, Unix
Rhino 4.0 Imports and Exports SketchUp Files and uses KZL to anchor Rhino files in Google Earth. It has a Google 3D Warehouse plugin - Windows, Intel Mac
SoftPlan 2D/3D - renders - imports/exports SKP - Windows
Solid Edge 2D/3D - Fee and Free 2D version - Windows
SpaceClaim Import/export SKP
SPIRIT CAD Imports SKP models into their BUILDING INFORMATION NETWORK and export SPIRIT models into SketchUp
Tinkercad Online 3D CAD editor working on any browser supporting HTML5/WebGL.
TouchCAD 3D modeling and unfolding - Windows, Mac
TurboCAD 2D/3D drafting, Import/export SKPs, Pro and Pro Platinum is compatible with SketchUp plugins - Windows, Mac
VectorWorks Native SketchUp import and export functions - Windows, Mac
Tip: Use one of the free CAD programs to convert files to a format SketchUp can use.
'Other' Programs that play nice with SketchUp
3DBrowser mootools - 3D file format browser, including support for SKP files with OpenGL viewer. Polygon cruncher too. Fee
3DPaintBrush Integrated 3D Warehouse access
Antiprism Polyhedron Modelling Software, create, transform, analyse, and visualise polyhedra. Free - multiple platforms
Autodesk Navisworks Reads SKP and many other formats
Cabinet Vision Version 5 will import SKP - Fee - Windows
DataCAD Exports SketchUp 7 and 8, insert SKP as a symbol or as XRef in subscription version. - Free, Fee - Windows
DIALux Accepts 3DS file from SketchUp for lighting design - Free - Windows
Duran Audio DDA Requires importer/exporter SU4AC - Windows
Gear Template Generator Gear program for printing out patterns. Export DXF, HPGL, CSV, SKP, PDF and bitmaps - Fee (online version is free) - Windows
GoSimulate Enmesh's plugin to integrate their mechanical analysis program with SketchUp models - unreleased beta
Home Designer Three programs offered by Chief Architect import SKP - Fee - Windows
L-Acoustics SoundVision Requires importer/exporter SU4AC - Windows
Live Interior 3D Version 2.6 added the ability to import SketchUp 8 models. - Fee - Mac
Microstation SKP Integration - Windows
Modo Polygonal and subdivision surface 3D modeler - Fee - Windows, Mac
Mozaik Software Cabinetry design, material list, cutlist and CNC applications and sends rendering data to SketchUp. Fee
SpaceClaim Industrial strength solid modeling kernel for mechanical modeling, imports/exports SKP files - Fee - Windows
Sketchers Studio Animate SketchUp models - Fee - Mac - Integrated 3D Warehouse access
Synchro Project Constructor Project scheduling and management for SketchUp models
Trelligence Affinity Schematic, shoebox design software with a SketchUp plugin
TurboCAD 2D/3D drafting, Import/export SKPs, Pro and Pro Platinum is compatible with SketchUp plugins - Windows, Mac
Ultimate Unwrap 3D Unwraps 3D Models - SKP importer - Fee - Windows