Jkaptive is a simple captive portal without RADIUS (and thus without total security, but at the same time without too much hassle). The reason behind this is because a lot of site administrators don't need tight security; their site is just a café that offers free Internet access on an unsecured WLAN access point connected to the Internet, and they need a ticketing system to make it cumbersome for average people to use this offering without actually buying a single coffee. Jkaptive itself just presents the login page and checks the token. The blocking of unticketed traffic is done through Linux' netfilter. As no proxy server is involved, jkaptive has no performance penalty, nor does it create problems with non-HTTP traffic. Once the token is accepted, jkaptive is out of the way of any network packets completely. For presenting the login page, jkaptive has a built-in Web server, so no additional Web server application is needed.
Metakit is a small, portable database library using a hybrid relational / hierarchical data model with a column-wise internal storage format. For C++, include a single header file and 125 kb DLL or statically link directly. Ideal for desktops, embedded systems, smartphones, and PDAs. Bindings for Python and Tcl. A very mature, stable code base.