GroupDocs - GroupDocs is a web-based service for online document sharing, collaboration and management.
Goodreads - See what your friends are reading.
Firmao CRM - CRM and ERP software for your business. Use free version for 14 days and register in Firmao.
LibraryThing - A home for your books.
FileProInfo - It's All About Files, Software, Online Tools - 100% Free
BookAuthority - BookAuthority collects the most recommended books on business, technology and science - as featured on CNN, Inc and Forbes