asdf is a tool version manager. All tool version definitions are contained within one file (.tool-versions) which you can check in to your project's Git repository to share with your team, ensuring everyone is using the exact same versions of tools.
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https://asdf-vm.com/guide/introduction.html#how-it-worksAlternative plus évoluée à netcat : ncat
via ArnaudB
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http://nmap.org/ncat/Swaks is a featureful, flexible, scriptable, transaction-oriented SMTP test tool written and maintained by John Jetmore.
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http://www.jetmore.org/john/code/swaks/