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Obsidian--ITS-Theme
Theme designed with readability and customizability in mind. Change it easily to your liking with the Style Settings plugin installed.
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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.
Obsidian has a lot of customizability, and it's all stored locally. I don't know how much Word offers but I imagine it's not a whole lot compared to it. There are lots of community made plugins and CSS snippets that help in worldbuilding, for example here.
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.