**Language Features:**
* surface() can now take PNG images as input
* List comprehensions, let()
* text() module
* offset()
* min() and max() can now take a wvector argument
* concat()
* 2D minkowski and holes
* chr()

**Program Features:**
* Added --viewall cmd-line parameter
* MDI
* FIXME: Windows cmd-line fixes
* Qt5, retina
* SVG import/export
* AMF import/export
* Color schemes for viewer and editor can be user-edited
* Improved editor
* Splash screen
* Docking of GUI components
* Toolbar
* More robust STL export

**Bugfixes/improvements:**
* Internal cavity fix
* Performance: 2D (clipper), preview, hull, minkowski, surface, n-ary-union, transforms (polyset)
* Performance: Reduce duplicate evaluation of identical expressions
* STL export/import fixes
* F6 stability fixes
* Better recursion behavior
* Reorganized examples a bit
* improved search() behavior
* Mac: Timestamps is output fixed

**Deprecations:**
* polyhedron triangles

**Misc:**