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Excallidraw is pretty good for 'hand-drawn-look' diagrams/sketches.
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For a decent network map you really need a network mapper and one of the finest has to be Netdisco - http://netdisco.org/. You will need to get CDP/LLDP(etc) and SNMP running everywhere to get the best out of it. Their support mailing list is one of the best.
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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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diagram as code https://diagrams.mingrammer.com/
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.