libposix is an impementation of the core functionality of all Unix systems. It is a full, cross-platform implementation of the POSIX 2008 standard. It is meant to replace existing implementations of a Unix system's core libraries. It is an exact implementation of POSIX 2008 and nothing else (no extensions, no previous POSIX versions). However, it works well with possible extensions to the core system functionallity (for example, GNU or BSD).
delegate.c implements an abstract function pointer by capturing a user-specified callback signature -- delegate() -- and exposing it through a simple interface -- invoke(). It provides something loosely approximating lambda expressions; or even more analogous, C# delegates. It includes a wrapper to support libevent callbacks to functions not matching the required libevent callback signature.
autober is a language for generating BER decoders. It's different from an ASN.1 compiler in that it's much simpler and it only deals with BER-encoded messages. It is intended for smart card and RFID applications where much of the data stored on these devices is, in-fact, BER-encoded TLV data. The language is designed to be very similar to the template definitions found in the specifications for smart card and RFID applications.
Libntoh aims to be a user-friendly library to provide an easy way to perform defragmentation and reassembly of network/transport protocols. It is intended to provide a flexible, thread-safe, and highly configurable environment for the user. It performs IP defragmentation and TCP reassembly.