I'd very much like a Spritz like plugin for Rockbox. It's a speed reading app that helps read web pages or pdfs in 500 words per minute or more, depending on how good you are at concentrating. The app itself is just a window for the words to be displayed, play/pause/next/previous/.. buttons and a scale for how many words per minute you'd like to read. So it would fit perfectly on a portable music player's display.
Unfortunately I have no idea about actual development, but the actual Spritz SDK is available for free at
http://www.spritzinc.com/developers/. They only offer the SDK for Android, IOS and "web", so I don't know how much help it would be if someone would try and create a Spritz plugin for Rockbox.
Either way, I'm grateful for any time and effort anyone puts into this, even if it's just checking things out and realizing that it's not doable.