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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.
There is a PR to support Markdown in JavaDoc. https://github.com/openjdk/jdk/pull/11701
I found another one for Java 9+, which even seems to be maintained: https://github.com/talsma-ict/umldoclet
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.