Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
This version contains seven new mainline campaigns, a redesigned user interface, a variety of high-quality new game music, and a refresh of the game artwork, including improved portrait images for many unit types. For designers, the map editor and WML have been enhanced to significantly increase your creative options in writing scenarios. Over 300 individual bugs were resolved during the 1.3 development period, and several new tools were introduced that prevent entire classes of bugs by sanity-checking the game's data files.