ShiVa v1.9 (by Stonetrip) is due to be released this week (as far as I can tell). ShiVa3D is a 3d development platform taylored towards anyone wanting to create 3D real-time applications and games for Web, Windows, Mac OS, Linux, iPhone, Android, Palm, Wii and the iPad. ShiVa is a powerful multiplatform 3D game engine, WYSIWYG 3D Editor and MMO Server.
It is probably the closest competitor to Unity3d which also offers a single editor/GUI for creating games and 3d applications for multiple platforms including the Web.
For the indie user, however, ShiVa's main advantage over Unity is that it enables you to develop for all aforementioned platforms for at a very reasonable price. Unity still charges individual prices for each platform.
In regards to using Softimage with it: Shiva imports DAE files but animated files exported directly from Softimage can be problematic. Shiva's importer purges duplicate keyframes and Softimage's export has no straight way of tweaking data (randomising keyframes) so that third party apps do don't do this.
I discovered this when I did some tests here:
Export options for Collada 5.1:
Several apps can process Softimage-exported DAE files correctly. Ultimate Unwrap 3d is one of them.