Note: Not all products of these manufacturers have external captive portal support.
Aerohive
Alta
Aruba including Aruba Instant, Aruba Instant On and Aruba Central
Cambium
Cisco including Meraki, Meraki Go and WLC
Coova Chilli
Cradlepoint
D Link
Draytek
Fortinet
Mikrotik
Open Mesh
OpenNDS
Plasma Cloud
Ruckus
TP Link Omada
Ubiquiti Unifi
Xirrus
Zyxel Nebula