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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.
The program meld (https://meldmerge.org/) is free and perfect for this task.
Git is software that many of us computer programmers use for managing all the code that we write. It's built to allow these kinds of comparisons, retrieve old versions of things, see who changed what, and so on.
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.