Remapping Capslock to Control:

Windows: https://github.com/randyrants/sharpkeys

Ubuntu Linux (don't know about other Linuxes): /usr/share/X11/xkb/symbols/pc

    key <CAPS> { [ Caps_Lock  ] };

->

    key <CAPS> { [ Control_L  ] };

This avoids needing to keep an AHK application (or other keybinding application) open. The Linux solution unfortunately resets after every version upgrade.