TuneD is an easy and effective way to optimize your linux system!
A window manager for the terminal. Yup. For real.
Very simply, this is a document viewer type version that plays a similar role as mailcap and other such utilities. Its focus is on displaying documents quickly in a terminal (or a popup terminal).
If you snickered, take a look at this project of mine that unifies manpages, apropos, cheatsheets, and TLDR sheets.