The pals from Hak5 built time ago the WiFi Pineapple, a WiFi hacking tool with a ready web GUI, and the project FruityWifi tried to make a Raspberry Pi version.
FruityWifi can be installed in any Debian based system and there's an ARM version for Raspbian, Pwnpi or Kali ARM.
To install, we just need to download the zip from the repo, unzip and run install-FruityWifi.sh. The installation script will install all the dependencies and setups. When done, we can launch a navigator pointing to https://localhost:8443 and login as admin:admin. There's an HTTP version at port 8000 but we prefer to discard this option due security reasons.
Once logged in we can install modules from its tab. Modules list and their installation were scripted to be as transparent as possible, checking for updated versions on their repositories.
A RPi3 has built-in WiFi capabilities, so it's enough to lift up an open AP routing it through Bettercap. Bettercap will intercept the POST queries and will perform the sslstrip downgrade when avaiable.