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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.
Probably 85% of what I do with it is within xochitl, the stock interface for taking notes. I don't use ddvk—it's too annoying to keep up to date—but I do use custom templates. (I'd love an official way to install templates and persist them across upgrades.) The reMarkable was a significant upgrade from my old paper notebooks, but I really missed the engineering-style grid paper I'd been using. So I made my own templates and use them. I wouldn't say I use custom templates because I'm upset with how the reMarkable is, but I wanted a little more than it gave by default.
See e.g https://github.com/reHackable/awesome-reMarkable or my stuff https://fabien.benetou.fr/Tools/Eink#remarkable but basically the official features are limited and the device, being Linux based, can be extended quite efficiently.