c-plus-plus gplv3 gpl3 visual-voicemail c-plus-plus-lang c-plus-plus-language blueberryos blueberryos-project blueberryos-development blueberryos-operating-system-project blackberryos-alternative blackberry-alternative blueberryos-apps blueberryos-applications blueberryos-apps-visual-voicemail blueberryos-visual-voicemail-app-project blueberryos-visual-voicemail-app-dev blackberryos-visual-voicemail-alternative