File download custom tag or bean

I know that you can download a file from a specific location within your
webapp by writing a servlet using OutputStream services.  However, it
has been done so many times, somebody must have created a custom tag or
bean for this feature.

Where can I find a custom tag or bean that would allow me to download
PDF and PPT files from my webapp and via a dialog box that would allow
you to either open the file from the browser or store it in your
desktop?

Thanks,

Lamine.