Unity Technologies says it now has over 100,000 registered users for its browser-based, PC, Mac, Wii and iPhone-compatible game engine and development platform.

Unity is particularly designed to enable developers to author 3D content on the Web and for the App Store. It's been a fast-growing member of the engine world, recently closing $5.5 million in funding from investment groups including Sequoia Capital, and offering a free version of its popular development environment.

Already an indie-friendly platform that focuses on lower entry barriers, the free license in particular makes Unity an increasingly viable solution for independent and start-up developers.

The company says it now wants to expand its strategy and unveil "new opportunities for Unity users" in the weeks to come -- CEO David Helgason has told Gamasutra recently that Xbox 360 support is in the works for Unity. "It’s amazing we’ve reached this milestone so quickly,” says Helgason today.

"We remain laser focused on pushing the edge in interactive 3D development and expanding usability, power and platform reach so developers can continue to create breakthrough content and take advantage of all the opportunities out there.”