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sdrtrunk
A cross-platform java application for decoding, monitoring, recording and streaming trunked mobile and related radio protocols using Software Defined Radios (SDR). Website:
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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.
It's worth mentioning that for trunked P25 systems, the voice channels are often spread out so they span more spectrum than the ~2.4 MHz bandwidth of an RTL-SDR, so you won't be able to monitor both the control channel and any voice channels that are too far away from it. I have had reasonable success decoding my county's trunked P25 public safety system with sdrtrunk and two RTL-SDRs, but that still only covers about 4.8 MHz of spectrum, so there are still channels that can't be received. I am considering upgrading to an SDR dongle with wider receive bandwidth (some will do 6 or 10 MHz, IIRC) so that sdrtrunk will be able to receive the control channel and any voice channels, and stop telling me it couldn't receive something because it didn't have a tuner available.