parse_conf is a library for parsing standard configuration or initialization files, and supports some extensions over the standard syntax for a configuration file. A very extensive reference resolution system is included. The library is reentrant to be safe when used in a multi-threaded environment.
ABL (Abstract Basic List) is a flexible abstract list library defined using the C preprocessor. It allows you to define linked lists of arbitrary types very easily. You also can use these lists as stacks or queues. You can easily define complicated types like a list of lists. It contains a set of functions to work on lists, including higher order functions for filtering and so on. The list includes detailed documentation in texinfo format.