"Shit, we're dealing with a sysadmin."
"[T]ool to aggregate several remote shells into one. It is used to launch an interactive remote shell on many machines at once." (ib. 2018-09-03)
Cf. http://repo.or.cz/w/polysh.git
Scripts, mostly for ksh and gawk, for system administration
"Postfwd plugin for blocking international spam botnets based on geographical location of IP addresses used to login to postfix via sasl." (ib.) Actually, this plugin locks out logins to compromised accounts once it counts too many logins from too many countries.
Open source tool designed to help network administrators collect, organize and maintain network documentation.