Added, Draw Grid mode: "Lock slices to grid" now operates in 4 modes: "None", "Horizontal", "Vertical" and "Both". Can be helpful when drawing ladders and such.
Changed, all drawing modes: changeable drawing mode settings are now persistent.
Changed: "Dynamic grid size" mode is now disabled when changing grid size manually.
Documentation: "Command Line Parameters" topic contained a lot of incorrect information...
Updated ZDoom_DECORATE.cfg.

Added, Visual mode: "Raise/Lower Floor/Ceiling to adjacent Sector" actions now take surrounding 3d floors into account.
Added, Visual mode: highlight/selection based on texture alpha now works on 3d floors.
Changed, Game configurations, TranslucentLine:208 action: renamed the second argument from "Translucency Amount" to "Opacity".
Internal, documentation: updated udmf_zdoom.txt.

Sector Edit Form, UDMF: Sound Sequence selector is now a drop-down populated by values parsed from SNDSEQ.
Documentation: updated "(G)ZDoom text lumps support" page.
Updated udmf_zdoom.txt.

Added Hexen -> UDMF and UDMF -> Hexen action conversion as described in "Universal Doom Map Format ZDoom extensions" (udmf_zdoom.txt). It is used when changing map format form Hexen to UDMF and from UDMF to Hexen.
Game configurations, Line Identification action: added "Front side only" (128) flag to arg1.
Game configurations, Line Identification action: renamed arg1 flags to match corresponding UDMF flag names.
Updated udmf_zdoom.txt.

Thing Edit Form, UDMF: added controls for setting pitch, roll, scale, render style, fill color, alpha, health and score.
Visual mode, UDMF: UDMF scale is now applied when rendering sprites.
Added Thing Statistics form (Edit -> View Thing Types...), which shows all loaded thing types with some additional info.
Visual mode: sprites with negative ScaleX and positive ScaleY were not rendered properly.
Classic modes: display was not updated after loading a sprite.
Current testing engine change was not saved on closing the program when no other game configuration settings were changed.

UDMF: added "gravity" thing property to UI.
MAPINFO parser: removed unneeded error notification. 

Added several UDMF properties to ZDoom configuration.

Added -strictpatches command line parameter to indicate strict patches loading for the WAD file loaded from command line
Added -resource command line parameter to specify additional resources for the WAD file loaded from command line (see cmdargs.txt for more information!)

Added -nosettings command line parameter which allows starting Doom Builder with only the default settings (no user settings) but any settings you make will not be saved (to protect your original settings).

@ Improved UDMF test map (slopes, 3d floors, colored lighting)

Exposed more DECORATE information to plugins and Things now have an Actor property (ActorStructure) when they are loaded from DECORATE
Added two new type handlers that can be used in UDMF ('Thing Type' and 'Thing Class')
Polished the browse icons and browse buttons.
Added more events for plugins to intercept.

- added more handling for 'invalid' UDMF types to cast them to the correct type

- added release checklist

- fixed curve lines menu item in linedefs menu
- changed the test map drop down menu (nomonsters option is now in the menu instead of a seperate button)

- edit selection mode now shows a rectangle selection that covers also the thing sizes
- fixed right-click to start drawing mode from linedefs mode
- fixed floor and ceiling texture coordinates in both classic modes and visual mode

removing a vertex that has exactly 2 linedefs attached now leaves one linedef connected to the other linedef's vertex. also removed some unneeded template code.