OpenVoucher is an open source voucher management / hotspot system for authenticating guests in your wifi or cable network. It is designed to be easy to use for anyone who wants to issue vouchers.
For further information and installation how to's, see the project's homepage.
The source code is maintained on Github.
TEF is a fully-featured, secure and has advanced capabilities including the intuitive Xsentry easy-to-use administration graphical user interface with WYSIWYG (What You See Is What You Get) front end which has drag and drop security policy deployment.