The SDRuno-Software in combination with one of the SDRPplay-devices (I use the RSP1A) is capable to measure/estimate the SNR reasonably well. The SNR is calculated based upon the selected bandwidth.
To quote SDRplay Tech_Support:.
"The SNR measurement is only for the selected signal as defined by the filter bandwidth defined within the Rx Control panel. The signal power is taken from the power meter measurement and the noise is estimated via an analysis of the entire wider band noise floor within the SP1 window to remove the effect of the presence of other signals. As such, the SNR measurement is not a precise measurement, but it is reasonably accurate."
Holger 'Geri', DK8KW