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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.
There are other GitHub clones written in Go (Gitea) and V (Gitly)
GitHub had great timing; they took a semi-new but powerful revision tracking system (git) add a feedback forum (issues), hosting, and mini social profile (to help personalize) wrapped together by a back-end language that was quick to develop on (Ruby).
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.