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The distance library is used to compare pieces of data for similarity. Specifically, it contains a number of methods to find the "edit distance" between inputs, or the number of differences between them. These differences are calculated using various mechanisms. The inputs to these functions can be character strings or arbitrary data.

Libdnsres provides a non-blocking thread-safe API for resolving DNS names. It requires that your main application is built on top of libevent. Libdnsres' API essentially mirrors the traditional gethostbyname and getaddrinfo interfaces. All return values have been replaced by callbacks instead. The code borrows heavily from the BSD resolver library. In fact, it is an extremely ugly hack to make the BSD resolver library non-blocking and thread-safe without changing the API too much.

The libdwarf library is the base for the dwarfdump utility by the same author. It implements routines to access the DWARF debugging information found in ELF object files.

Libeio is a full-featured asynchronous I/O library for C, modelled in similar style and spirit as libev. Features include: asynchronous read, write, open, close, stat, unlink, fdatasync, mknod, readdir etc. (basically the full POSIX API), sendfile (native on Solaris, Linux, HP-UX, FreeBSD, emulated everywhere else), read-ahead (emulated where not available). It is fully event-library agnostic and can easily be integrated into any event-library (or used standalone, even in polling mode).

Libconfig is a simple library for manipulating structured configuration files. The file format is more compact and more readable than XML. And unlike XML, it is type-aware, so it is not necessary to do string parsing in application code. Libconfig is very compact -- just 25K for the stripped C shared library (one-fifth the size of the expat XML parser library) and 39K for the stripped C++ shared library. This makes it well-suited for memory-constrained systems like handheld devices. The library includes bindings for both the C and C++ languages. It works on POSIX-compliant UNIX systems (GNU/Linux, Mac OS X, Solaris, FreeBSD) and Windows (2000, XP and later).

Lightweight C library that eases the writing of UNIX daemons

Privman is a library that makes it easy for programs to use privilege separation, a technique that prevents the leak or misuse of privilege from applications that must run with some elevated permissions. The Privman library simplifies the otherwise complex task of separating the application, protecting the system from compromise if an error in the application logic is found. Applications that use the Privman library split into two halves, the half that performs valid privileged operations, and the half that contains the application's logic. The library uses configuration files to provide fine-grained access control for the privileged operations, limiting exposure in even of an attack against the application. When the application is compromised, the attacker gains only the privileges of an unprivileged user and the specific privileges granted to the application by the application's Privman configuration file.

Libev is a high-performance event loop/event model with lots of features. It is modelled (very loosely) after libevent and the Event perl module, but aims to be faster and more correct, and also more featureful. And also smaller.

libevdev is a wrapper library for evdev devices. It moves the common tasks when dealing with evdev devices into a library and provides a library interface to the callers, thus avoiding erroneous ioctls, etc. The eventual goal is that libevdev wraps all ioctls available to evdev devices, thus making direct access unnecessary.

Libewf is a library for support of the Expert Witness Compression Format (EWF), it support both the SMART (EWF-S01) and EnCase (EWF-E01) format. Libewf allows you to read and write EWF files. Recent versions also support the LEV (EWF-L01) format.