Spotipo
Cloud captive portal for 30+ routers. Vouchers, paid WiFi, email capture, social login, white-label MSP support, GDPR compliant.
CoovaChilli
Most deployed open-source captive portal engine. RADIUS auth, runs on Linux, OpenWrt, DD-WRT. Fork of original ChilliSpot.
pfSense Captive Portal
Built-in portal in pfSense firewall. Vouchers, concurrent user limits, RADIUS auth, custom HTML splash pages.
ChilliSpot (Legacy)
The original open-source captive portal. No longer maintained. CoovaChilli is the recommended drop-in replacement.