Android - RuuviTag scanner, datalogger/gateway
With this app you can easily monitor RuuviTag bluetooth sensors https://ruuvi.com/index.php?id=2. It can also be used as a gateway for your tags, lettings you see and log sensor readings in the cloud.
This app can be found on play store https://play.google.com/store/apps/details?id=com.ruuvi.station