International US QWERTY layout with AltGr (Right Alt) dead keys via AutoHotkey script and MSKLC source.
In UltimateKEYS, all keys remain exactly organized as US QWERTY. Except, when AltGr (Right Alt) or AltGr+Shift (Right Alt + Shift) is pressed in combination with another key, other diacritics and symbols are accessible and some keys become dead keys.
In that way, it is - somehow - similar to the layout "United States-International" (on Windows), although this project moves all dead key combinations to the modifiers AltGr and AltGr+Shift. That way, this project solves the most typical issues, among which the quotes (' and ") can be used as usual (without pressing the spacebar afterwards), while the acute accent (´) and diaeresis (¨) are found on AltGr+' and AltGr+Shift+" respectively. This project has borrowed several aspects from the EurKEY Keyboard Layout (by Steffen Brüntjen).
This AutoHotkey script is a highly customizable version of UltimateKEYS. To work properly, the Windows keyboard has to be set to standard US QWERTY and at least AutoHotkey v1.1 (preferably as 'Unicode 64-bit', on 32-bit Windows as 'Unicode 32-bit') is required.