Most of the companies and educational institutions forbid certain types of files to be downloaded. For example, most of the institutions block mp3 files or even zip files so that the bandwidth can be used only for the desired purposes. But people like to download their documents and songs while they are at work.
If you want to download a certain type of file at work, you can use the following websites to download your stuff.
These sites allow you to download certain types of files. Just type the URL in the field given and select the type of file to be downloaded, name the file and press Go. The file will be downloaded even with all the restrictions of your network.
The types of files that can be downloaded are zip, doc, pdf, xls and aaa.