SilverSplash is an open source captive portal developed by Silver Lining Networks. SilverSplash runs in a Linux environment and provides a simple captive portal which offers PayPal based paid service, as well as OpenX compatible free advertising service.
The technical discussion list is located at Google Groups. For help installing and configuring SilverSplash, please join the discussion list and review the list archives prior to asking new questions on the list.
SilverSplash development can be tracked at github, and releases are available on the CPAN.