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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.
WAMP and XAMPP are great if you're looking to do projects outside of WordPress, and learn different web-based stuff. I've actually started working with Craft CMS to learn something new, even though I should just be learning a JS framework at this point, since there are so many places that want an Angular or React developer right now.
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.