The libQtCassandra library is an advanced C++ library used to access Cassandra servers. Unlike the basic Cassadra server interface, this C++ library provides separate objects that handle each level of the server data, i.e. the cluster, contexts, table, rows, and cells. It uses Qt and the Qt style for all the classes, which makes it very easy to use if you already know Qt.
The libQtSerialization library is a Qt extension that makes it easy to serialize your data in a forward and backward compatible way. The library is composed of QWriter and QReader. The writer is straightforward - all you have to do is call a writeTag() function and the data is serialized. The reader is a little more complex as it supports special cases, such as sub-classes (so you can save a tree of classes) and arrays of classes (your tree may be composed of multiple instances of a given object).
Devices for the measurement of signals use different data formats to store the data on disk. libRASCH provides a common application programming interface to access such signals, regardless of which storage format is used. Additionally, it provides support for processing (e.g. detects beats in an ECG) and viewing the signals. This functionality and the access to the various file formats is realized with plugins.
libSieve is an implementation of the Sieve mail sorting language originally developed for the Cyrus mail system. libSieve helps to bring mail sorting functionality into your mail server application without the need to reinvent the wheel. As a library, it is not intended for end users expecting a ready-to-run program.
libTISCH is a framework for easy development of multi-touch applications. It contains tools for video processing, calibration, gesture recognition and, most importantly, a GUI toolkit with widgets that utilize the multi-touch gestures detected by the lower layers. It runs on Linux, Mac OS X, and Windows.
Libtextcat is a library with functions that implement the classification technique described in Cavnar & Trenkle, "N-Gram-Based Text Categorization". It was primarily developed for language guessing, a task on which it is known to perform with near- perfect accuracy. Considerable effort went into making this implementation fast and efficient. The language guesser processes over 100 documents/second on a simple PC, which makes it practical for many uses.
libUTL++ is a C++ class library that includes a wide range of highly re-usable functionality and abstractions. It uses templates in some places, but generally favors an object-oriented design. The library covers functionality in areas such as containers, text processing, memory allocation, date/time manipulation, stream I/O, data compression, and others. It also includes abstractions to facilitate common tasks such as object copying, comparison, serialization, etc.