HelenOS sources
KC_NPLUS 112 uspace/drv/hid/adb-kbd/ctl.c [0x45] = KC_NPLUS,
KC_NPLUS 149 uspace/drv/hid/atkbd/atkbd.c [0x79] = KC_NPLUS,
KC_NPLUS 137 uspace/drv/hid/usbhid/kbd/conv.c [0x57] = KC_NPLUS,
KC_NPLUS 142 uspace/drv/hid/xtkbd/xtkbd.c [0x4e] = KC_NPLUS,
KC_NPLUS 223 uspace/srv/hid/input/ctl/sun.c [0x7d] = KC_NPLUS,
KC_NPLUS 179 uspace/srv/hid/input/layout/ar.c [KC_NPLUS] = '+',
KC_NPLUS 208 uspace/srv/hid/input/layout/cz.c [KC_NPLUS] = '+',
KC_NPLUS 187 uspace/srv/hid/input/layout/fr_azerty.c [KC_NPLUS] = '+',
KC_NPLUS 188 uspace/srv/hid/input/layout/us_dvorak.c [KC_NPLUS] = '+',
KC_NPLUS 182 uspace/srv/hid/input/layout/us_qwerty.c [KC_NPLUS] = '+',
HelenOS homepage, sources at GitHub