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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.
Like others have said, at ultimate guitar they just require you to make a free account to access user made tabs, the pro and official tabs are paywalled because they created them (although suspiciously you don't really see any that don't already have user created tabs..). If using the site annoys you, like it does me, you can use a program I wrote to interact with it for you. Put in an artist and it will grab all available gp tabs from them in a batch. https://github.com/jabbey1/UGDownloader
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.