is there an opensource UEBA that can be integrated with Elastic stack?
and also a Netework monitoring tools
I'm not aware of a free/open source UEBA to work on top of the Elastic stack.
Regarding network monitoring tools, we have Filebeat integrations for Suricata, Zeek, and Packetbeat. Depending on what you are looking for, those might be good options.
Thank you. This is very helpful