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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.
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Lailloken-UI
Path of Exile UI and QoL overlay. Emphasizes ease of use, minimalist design, and seamless integration.
Path of Building (Base & Community Fork) - Your most important tool. It allows to import your (or somebody else's) character and look at their actual stats. PoE is notorious for giving you random values in the tool tips that do not reflect what's actually going on. Aside from pre-planning the character with all the items at your disposal, it also allows to check stats of your minions and check your values against the endgame bosses.
There's also https://pobb.in/ as a handy pastebin alternative for sharing PoBs. Lets you look at them at a glance from the web/mobile without having to launch the client.
https://github.com/Lailloken/Lailloken-UI is a great resource + integrates exile leveling and regex search strings into an autohotkey based ui