what types of projects or products can anyone make using MARK.SPACE and with what browsers and programs can it work with 
Well, there is a wide range of projects/products that you may create inside MARK.SPACE - from your virtual residence (which could be 3D/VR-version of your real home or just your dream place) to 3D/VR shops, offices and so on
Did you check our demo? http://demo.mark.space