“#EFF is releasing an experimental hacker alpha release of wireless router software specifically designed to support secure, shareable Open Wireless networks. [...] Allow small business and home users to easily enable an open network, so guests and passersby can get an Internet connection if they need one, while keeping a password-locked WPA2 network for themselves and their friends or coworkers.”
▻https://www.eff.org/deeplinks/2014/07/building-open-wireless-router