You can download In2Space 1.04 for Mac from our application library for free. The actual developer of this software for Mac is PRD Software. The application lies within Design & Photo Tools, more precisely 3D Modeling.
From the developer:
In2Space has been designed as a complementary partner to PowerCADD providing easy transition from 2D into 3D. In2Space is an architectural modeler having tools specifically designed with buildings in mind. The app allows you to paste 2D drawings right from PowerCadd into 3D.
You may want to check out more Mac applications, such as TkMatMan, 3D-Coat-V3 or JMRI, which might be similar to In2Space.