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IoTGoat
IoTGoat is a deliberately insecure firmware created to educate software developers and security professionals with testing commonly found vulnerabilities in IoT devices.
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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.
On a related note, check out IoTGoat - it's a deliberately insecure IoT firmware image based on OpenWRT that you can use to explore a lot of common design flaws in embedded Linux devices: https://github.com/OWASP/IoTGoat
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.