Manifold 9 GIS is now (finally) available from manifold.net at an introductory price of $345 through the end of January 2018.
A Radian Studio license may be upgraded to Manifold 9 GIS for $125 through the end of January.
Unfortunately, no upgrade pricing is available to holders of Manifold 8 GIS and earlier; taking advantage of the introductory pricing on Manifold 9 GIS is recommended.
This is a long-awaited update to Manifold 8 GIS released in 2007.
The user manual is available online.
The free but save-disabled Manifold Viewer is available to try Manifold capabilities before committing to buy a Manifold GIS license.
I am not in any way associated with Manifold sales and I apologize if this message seems like advertising, it was meant to be informative... in case you didn't see the release announcement elsewhere.