Windowblinds is a Windows only product.
Object Desktop was originally an OS/2 product only until Mr. B. Wardell didn't get his way with IBM and moved to the Windows platform while dropping the OS/2 product line altogether.
I'm not sure if OD for OS/2 is still being sold, if so, it hasn't been updated in years and it is extremely unlikely that it ever will be. Certainly the gap between the product on the above mentioned platforms are so great now, that there is only a small correlation.
I use OD for OS/2 and I find some of applications indispensable, though there have been some attempts to duplicate them, only a few have been successful, others having varying degrees of success.