Acat is s web portal where you can find several kind of information, from a material e-catalog, vendors and service providers info in USA, to information links for software, BIM blogs and more.
Arcat has a web page where you can download BIM elements. This library is organized according Master format Catalog in both versions, ’95 and 2012. The difference between them is the number of divisions; the 95 version has 16 while 2012 version has 48.
Most of BIM elements you can download are available for Revit, AutoCAD and Microstation.
Arcat has also a web application that can help you to create Project Specs. This tool is available only in English.