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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 always recommend Oh My Git to my students.
I generally recommend the Peepcode Git Internals book. The first half explains the internals of how Git works, and the second half is a command reference.
GitHub is Microsoft's privately owned service that provides hosting and other features for Git repositories. There are other services which provide comparable services: GitLab, BitBucket.. You can also self-host such a service (Gogs, Gitea..).
Pro Git v2 is a great book to start from and refer to.
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.