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getssl
obtain free SSL certificates from letsencrypt ACME server Suitable for automating the process on remote servers.
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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.
I first got by with self signed certificates, but with all the major browsers warning they'll stop supporting those eventually I finally bit the bullet last month and installed getssl to automatically update all my certificates once a month.
NOTE:
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Hence, a higher number means a more popular project.