Haru is a free, cross platform, open-sourced software library for generating PDF written in ANSI-C. It can work as both a static-library (.a, .lib) and a shared-library (.so, .dll).
Self-Contained CGI (sccgi) is a C++ application that can be customized by developers looking to write high-performance web applications. It includes several database adapters and a template engine. Additionally, it can be extended with Lua.