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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.
Download the community fork of Path of Building (pob). This is a build simulator where you can theory craft and test items/passives/gems. It's probably the single most useful third party tool for the game. There's a slight learning curve but it is worth it. Plenty of good starter videos out there just for pob too, like this video from popular content creator Zizaran.
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.