The Yore project intends to create a cross-platform RPG engine, with a World Editor that supports the creation of both single-player and multi-player RPG worlds. The project's SF account just started -- more info available within a couple days.
A 3d physics game. Goal is to build a construction to bring an object to a goal. Integrated level-editor. You can build rods, blocks, spheres and powered wheels.
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Orange 3D, a game engine distributed under the zlib/libpng license, is an all in one solution, with IDE, level editor, 2d painter, 3d modeler, and possibly audio editing software all in one clean package, for free!
Legatus (development code-name) is a futuristic Role-Playing Game. Taking aspects from Fallout, Arcanum, Baldur's Gate and such, the game focuses on a realistic system, and includes an editor for creating new modules, scripts and quests.
Originally a fork of Legend of Mazzeroth, this project aims to create an engine rather than a game. It aims to be a 2D MMORPG engine, fit for easy customization through Ruby. It also features an edit of Tiled, the map editor made at www.mapeditor.org