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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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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
I use it extensively in my MRISC32 ISA manual (much of which is generated by a Python script): https://github.com/mrisc32/mrisc32
Also I would recommend SystemRDL for creating a definition usable in code generators: https://github.com/SystemRDL/systemrdl-compiler
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.