openscad

Features:

Snappier GUI while performing CGAL computations (computations running in separate thread)
The size of the misc. caches can now be adjusted from Preferences
The limit for when to disable OpenCSG can now be adjusted from Preferences
Added Dot product operator: vec * vec
Added Matrix multiplication operator: vec * mat, mat * mat
Added search() function
Dependencies are now tracked - any changes in uses/included files will be detected and cause a recompile
The OPENSCADPATH environment variable is now implemented will have precedence when searching for libraries
.csg files can now be opened from the GUI
linear_extrude() will now assume that the first parameter means 'height' if it's a number

Bugfixes:

use'ing an non-existing file sometimes crashed under Windows
Better font handling: Ensure a monospace font is chosen as default
Division by zero caused hang in some cases (e.g. sin(1/0))
Larger minkowski operations sometimes caused a crash after a CGAL assert was thrown
Fixed crashes in shared_ptr.hpp (or similar places) due bugs in cache management and CSG normalization
scale() with a scale factor of zero could cause a crash
Fixed a number of issues related to use/include
Providing an unknown parameter on the cmd-line caused a crash
cmd-line overrides using -D now also work for USEd modules
Modifier characters can now be used in front of if statements
rotate() with a vector argument with less that 3 elements used uninitialized variables, ending up being non-deterministic.
.csg files will now have relative filenames whenever possible
Don't just ignore geometric nodes having zero volume/area - when doing difference/intersection, they tend to turn negative objects into positive ones.
Always use utf-8 file encoding, also under Windows
A lot of build script fixes
Some other crash bugs fixes

Deprecations:

The old include syntax "<filename.scad>" without the include keyword is no longer supported and will cause a syntax error.