This is my layout, fully one-handed, inspired by the FrogPad layout and adapted to German and French use. I am using it on a Mac, so it is designed in a way that I can easily use shortcuts such as ⌘ + ⇥ to jump between windows or ⌘ + space to get to Spotlight instead of having to move my hand to the trackpad. Oh yes, and since my surname is annoying to type with such a “frogboardio” layout, it has a Macro with my surname. 
(Sorry for the bulky design, was too lazy to translate it into the layout editor…)