Custom Field Inputs Plugin

Can anyone recommend a plugin that allows custom fields within the wysiwyg area? Or, even better, a plugin that allows a way for a non-technical person to upload .xls/.csv files via a nice interface? I need different fields per page though. In other words, one page might have an area to denote project names, dates, etc., and then another page would have something very different. I would also like to have an image associated with some list items…if possible.

I’m starting my search and thought to ask if anyone has already worked with something that they believe could also work for me.

Thanks in advance…