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VoIP
Web Base Telnyx/Twilio VoIP Interface enabling SMS, MMS and Voice calls using the providers API Keys and self-hosting the application.
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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.
Yeah, good on ya. If you're tech savvy enough you might take a look at the VOIP suite MB mentions here: https://www.inteltechniques.com/sms.html (the repository is here: https://github.com/0perationPrivacy/VoIP)
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.