Another Google docs alike service that allows you to open and view various document file format online. If you have a Google account then you can make use of Google docs to open XLS, Docx files but here is a alternative which can be used without registering an account and the file can be shared, embedded into social networks.
View docs online will help you in opening XLS without the need to download Microsoft excel, docx without MS Word 2007 and PPT file extension online quickly, easily and for free. All you have to do is to upload the document or file or choose the file from the web url and wait till it processes and shows the content of the uploaded document. This is an useful solution as the service is free to use. Other file formats supported by View docs online are