Add Software NETworkManager

[BornToBeRoot]

Thank you for taking the time to work on a PR for Awesome-Sysadmin!

To ensure your PR is dealt with swiftly please check the following:

• Your additions are Free software
• Software you are submitting is not your own, unless you have a healthy ecosystem with a few contributors (which aren't your sock puppet accounts).
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• Format your submission as follows, where Demo and Clients are optional.
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• Additions are not already listed at awesome-selfhosted
• The Language tag is the main server-side requirement for the software. Don't include frameworks or specific dialects.
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• Any software project you are adding to the list is actively maintained.
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Please take some time to answer the following questions as best you can:

• Why is it awesome?

It's a powerful open source tool for managing networks and troubleshooting network problems!

You can connect to remote systems and manage your network and server infrastructure using tools like Remote Desktop (RDP), PuTTY (SSH, Telnet, Serial), PowerShell (WinRM), TigerVNC (VNC), or AWS Console (AWS SSM). Analyze, troubleshoot, and obtain detailed information about your network and systems with features such as the WiFi Analyzer, IP Scanner, Port Scanner, Ping Monitor, Traceroute, DNS Lookup, and LLDP/CDP Capture (and many more) — all within a unified interface. Hosts and networks can be saved in encrypted profiles and used across all features.

• Have you used it? For how long?

I am the maintainer of the software and it exists since ~2017. It has 7,4k stars on github.

• Is this in a personal or professional setup?

Both

• How many devices/users/services/... do you manage with it?

From a few devices at home, to several hundred in corporate environments. (At least from the setups I know)

In theory, there is no limit -.-

• Biggest pros/cons compared to other solutions?

Pros:

• A lot of features included relative to network / server management like rdp/vnc/ssh/serial + tools like dns, ntp lookup, traceroute, etc.

Cons:

• Profiles cannot be synced/shared with a team.

• Any other comments about your use case, things you've found excellent, limitations you've encountered... ?