https://openwrt.org/docs/guide-user/services/captive-portal/start

CoovaChilli

uspot

drop-in replacement for CoovaChilli / nftables , RFC8908 Captive Portal API - https://github.com/f00b4r0/uspot - credentials : a simple username/password authentication - click-to-continue - radius - uam : remote RADIUS / MAC-based authentication bypass

NoDogSplash (NDS)

a simple way to provide restricted access to the Internet by showing a splash page to the user before Internet access is granted. - https://openwrt.org/docs/guide-user/services/captive-portal/nodogsplash - Screenshot: https://user-images.githubusercontent.com/56849408/67450477-ed622100-f5f3-11e9-8a49-9323d2ff94e7.png