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Salamandra
Salamandra is a tool to find spy microphones that use radio freq to transmit. It uses SDR.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Additionally you could look at a more DIY option and try out Salamandra which just needs a small rtl-sdr antenna which is typically used for TV/Radio
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.