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I tried draw.io, but ended up liking LibreOffice Draw better for hand-drawing.
If you want to get a live map of the connections on your network you may want to check out netdisco.org or librenms.org. Both are open source network management tools that have mapping.
Monit works for me. Good basic monitoring solution that can also restart a service/interface.
I also use LibreNMS to do alerting for a variety of conditions (syslog events, sensor conditions, outages and services via nagios). But this is more work to get set up.