qwpr Keyboard Layout
qwpr layout came out in 2013, created by Jameson Quinn.
(he sent me his layout https://plus.google.com/116662972767974604432/posts)
This layout is similar to QWERTY, only 11 letter key changed. But it also define layers to let you type some math symbols, and cursor movement.
note: Colemak moved 17 keys.
one interesting feature of qwpr layout is that it incorporates navigation keys (← → ↑ ↓) and also Tab and Return in one of the layer. Also, it lets you type many language chars (e.g. é ü ñ …) and Unicode symbols.