beef: BeEF is short for The Browser Exploitation Framework. It is a penetration testing tool that focuses on the web browser.
revshells.com: generates your web/reverse shell payloads in a few clicks.
shellerator: Shellerator is a simple command-line tool aimed to help pentesters quickly generate one-liner reverse/bind shells in multiple languages (Bash, Powershell, Java, Python, etc).
weevely3: Weaponized web shell.
weevely generate <password> <path>weevely <URL> <password> [cmd]