Muto, Partner Report, Divvy, Batifier, Drain, AM2 Tools
These apps do not share any data outside of the device upon which they are installed. All data is stored locally and only accessible from the app itself.
Muto requires access to the device camera in order to scan QR codes generated by another Muto instance.
No image is taken or stored by the device. The QR code scanned contains basic data such as the time the device will be locked down for.