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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.
After having issues with Xournal++, I started looking for a replacement app to annotate PDFs on my Surface Go (v1). I discovered Rnote (https://github.com/flxzt/rnote) and am really impressed. My main use is for study, bringing in math textbooks and completing the exercises. Rnote imports the PDF as a continuous vertical document and allows seemingly infinite space for annotation to the left and right, as well as on the pages themselves. It also functions as an awesome whiteboard app if you don't need PDFs. Performance is pretty good with the limited hardware but uses most of the 8GB RAM. All in all a great replacement for Xournal++.