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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.
OWASP ZAP is awesome when you are starting out, and keeps you from getting lazy. Pair it with something like https://github.com/projectdiscovery/interactsh for Out Of Band interactions (which would be the alternative to Burp Collaborator) and it will be pretty complete.
NOTE:
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Hence, a higher number means a more popular project.