meshmixer08 is available for Microsoft Windows and Apple Mac OS X. If you have problems, please post in the forums.

Windows
(tested on Win7 x64)

[meshmixer08 Win 32-bit] (Latest: January 26, 2013)
[meshmixer08 Win 64-bit] (Latest: January 26, 2013)

Mac OSX
(tested on Lion 10.7, should also work on Snow Leopard 10.6)

[meshmixer08 OSX 64-bit] (Latest: January 26, 2013)


Release History

[January 26, 2013] bugfix update
[Win32] [Win64] [OSX]
- fixed various small bugs found by users

[January 24, 2013] meshmixer08 update!
[Win32] [Win64] [OSX] [Video] [Forum]
- support for snapping and units in Transform tool
- new Units Tool to set physical scale of model and convert between units
- new Stability Tool to analyze whether model will fall over
- Stability tool also computes volume and surface area
- new Overhang Tool and real-time shader to visualize overhang regions
- new Measuring Tool with various measuring modes
- PlaneCut now faster, more robust, can "slice" to keep both sides, and be restricted to a selection
- new GenerateFaceGroups Tool to find face groups on imported models
- Support for Color-Per-Vertex OBJ and binary STL
- Improved image format support (now supports JPG!)
- Booleans and Join tools significantly more robust
- many other small bugfixes and improvements

[October 26, 2012] (meshmixer08 update)
[Win32] [Win64] [OSX]

- vertex pins in SmoothBoundaryTool can now be moved
- can now specify custom base directory (see FAQ)
- misc bug fixes

[October 24, 2012] (meshmixer08)
[Win32] [Win64] [OSX] [Video] [forum]

- new Face Group support and manipulation tools
- new Stamp tool to insert polygons into surfaces
- new Convert To Polygon tool to create polygons
- new Attract to Target brush to pull surface towards a selected target object
- improved Booleans, Join tool, and Plane Cut tool
- SmoothBoundary tool now supports placing vertex pins
- Ground-plane Grid and Origin guide
- improved Transform Widget with angle-snapping guide and toggle between local and global coordinate systems
- updated Align tool for quickly positioning objects
- new brush options for continuous Flow, Hold Boundary, and Restrict to Group
- UI tweaks like variable-speed sliders
- bugfixes, performance improvements, etc

[July 12, 2012] (meshmixer07 update 5)
[Win32] [Win64] [OSX]

- new Close Cracks tool for welding together existing seams
- Hide selected objects with ctrl+v (ctrl+shift+V to show all)
- Combine now supports arbitrary number of objects
- smarter handling of importing objects with very different sizes
- tweaks for Face Selections (expand/contract, optimize)
- Add(shift) / Remove(ctrl) for slice-lasso in Face Selection
- improved Face Selection rendering
- huge cleanup of memory leaks
- many, many bug fixes

[May 18, 2012] (meshmixer07 update 4)

- Preliminary Texture Support (see this forum thread for details, limitations, etc)
- bugfixes
- new camera hotkeys

[February 8, 2012] (meshmixer07 update 3)

- Separate tool for converting selection to new object
- Transform tool can now be applied to entire objects without a selection (just hit 't')
- Plane Cut tool for slicing through entire object with a plane, and filling any closed loops (make flat parts!)
- Mirror tool for mirroring object across a plane. You can move the plane. Fun!
- Duplicate tool for copying selected object(s)
- numeric parameter value entry (double-click on the parameter slider)
- Scene Object Browser (initially minimized, click on bar in bottom-right corner)
- beta Align tool that can align objects to x/y/z planes   (by default aligns last mirror/cut plane)
- bug fixes (tools, import/export, scaling) and ui tweaks
- transform widget rotation now snaps to 45-degree angles when you hold shift
- fixed some import/export scaling bugs

[January 17, 2012] (meshmixer07 update 2)

- Fixed broken PLY import, OBJ export
- Transform tool now has 3-axis manipulator
- Extrude/Extract now have x/y/z axis direction options
- new Remesh tool for refinining and reducing areas (beta)
- new Join tool that automates ZipperBrush/Weld workflow (beta)
- Selection brush now has crease-angle threshold
- new hotbox (hold spacebar)
- view-axis snapping (in hotbox)
- visual camera controls (drag on icons in hotbox)
- fit-to-view on object or selection (in hotbox)
- custom background color (in hotbox)
- many other bugfixes/improvements

[December 22, 2011] (meshmixer07 update)

- Restored main Drag-and-Drop functionality from meshmixer06
- Mac OSX build available for Lion and Snow Leopard
- Convert to Part now works with selections
- vastly improved rendering speed (millions of triangles!)
- improved brush performance
- many bugs fixed

[October 26, 2011] (meshmixer07)

- New Transform Faces tool (under the Deform menu)
- Extrude tool applied to an entire open mesh now produces a Shell
- New Extract tool for creating an offset copy of selected region
- New Reduce tool for reducing triangle count, with Adaptive mode.
- Improved Erase-and-Fill tool
- New SurfaceBrush tool [details]
- Custom stamp textures for SurfaceBrush (right-click on stamp bar to import your own)
- Stamp texture Align-to-stroke toggle and Spacing control
- SurfaceBrush Draw3 mode (like a Clay brush) and DrawMax mode (like a Layer brush)
- SymSnap toggle for VolumeBrush that snaps brush position to surface during symmetry
- Volumetric toggle for VolumeBrush that limits brush to connected regions
- Move mode for VolumeBrush that doesn't modify mesh
- Vertex Color Painting brush modes [details]
- Blur/Smooth Paint brush mode for SurfaceBrush.
- Restore-Defaults for brush settings (click on the properties bar headers)
- Custom Materials (right click on the materials bar to import your own)
- Support for PLY import/export with Vertex Colors
- Option to Append imported meshes to current scene
- Import Plane to create initial default plane mesh
- Selections are now preserved after most operations
- Hotkeys have been redesigned [list]
- forum threads with more info: [1] [2] [3] [4] [5] [6]

[May 16, 2011] (meshmixer05)

- Reduce & Refine brushes for triangle management
- AdaptiveReduce brush for preserving detail when reducing
- ZipperEdge brush for pulling open boundaries toward eachother
- WeldBoundaries tool for joining nearby boundary edges
- Extrusion tool for extruding areas of faces
- SmoothBoundary tool for smoothing edge loops
- Bridge/Handle tool for creating mesh tubes between areas
- Open, Save, SaveAs for fast binary .mix file form
- 60-second AutoSave for crash recovery
- reorganized ActionBar menus
- fix for OpenGL shader compiler crashes
- ALT+CTRL+LMB to zoom, ALT+SHIFT+LMB to pan (for pens)
- [ and ] control brush size (previous/next view moved to ( and ) )
- free rotate option (under View/Config menu)
- brush rendering improved (symmetry line, stamp darkness)
- Symmetry option for Selection brush
- Selection brush now restricted to front-faces

[April 16, 2011] (meshmixer04 update)

- improved fallbacks for OpenGL failures/driver limitations
- added Basic Rendering mode
- added Log File Generation to aid in troubleshooting
- capped undo/redo memory usage

[April 12, 2011] (meshmixer04 update)

- fixed catastrophic file-export that was corrupting OBJ meshes
- fixed rendering glitch with selection hilight

[April 7, 2011] (meshmixer04 release)

- Volume Brushes with dynamic meshing refinement (Drag, Draw1/2, ShrinkSmooth, BubbleSmooth, RobustSmooth, Flatten, Inflate, Pinch, Spikes)
- improved rendering
- new color schemes
- crash recovery

[March 7, 2011] (meshmixer03 release)

- complete interface rewrite
- 64-bit and (beta) OSX versions
- full Undo/Redo support
- new Deform tool for push/pull surface editing
- new Smooth Brush tool for local mesh smoothing
- Selection tool now defaults to a Brush Mode
- Better large model support (can work with millions of triangles)
- Publish to Shapeways dialog
- in-app feedback and bug report submission (requires email)
- many performance improvements and bug fixes