Free core library software for linux

Fid Core Library is the core library for the Frigand Imperial Desktop, a genuine Unix desktop environment based around multiprocessing, text-stream IPC, and the "everything is a file" concept.
It supports Emacs-like extensibility, customizability, and built-in multi-buffer support.
Enhancements:
- This release adds testing support for the axioms over buffer implementations and user interfaces, a better implementation of interactive, and a new cursor movement mechanism that allows the user interface to manage point itself (and, hence, keep it always on a widget).

conexus is a generalized C++ I/O library that includes support for BSD sockets, serial/TTY, and packet capture (via pcap).

conexus library utilizes sigc++ for object communication. A companion library, conexusgtk, provides a set of gtkmm widgets.

XML-Parse library is a lightweight set of re-usable functions for general purpose parsing, checking, and creating xml files. It can support stream-oriented, SAX or DOM parsing styles, and includes an optional xsd schema validator and graphical schema generator.
It supports all valid XML, and includes checking for validity. This library has minimal dependencies, and is totally self-contained. XML Parse Library project is written in C and is both speed and memory efficient, and is simple to use. Primary core functions have been posted, and additional advanced and useful XML-related utilities will be added. Released under MIT License.
The XML-Parse library contains functions for parsing and/or creating xml files in a variety of ways. You should use whichever set makes sense for your needs. The functions support the following alternative ways of working with XML files:
- Read whole xml-files into a tokenized tree-structure in memory, and then operate on, traverse, access, or further decode values out of the tree. Your custom application code is usually required to access and operate on the tokenized-values.
- Read xml-files, parse and interpret them as they are being read. Your custom application-specific code can be interspersed with the re-usable parsing calls to interpret, convert, operate-on or store values immediately as input-stream is read, instead of storing in an intermediate tokenized-tree structure. This method reduce time and memory requirements, and supports streaming operations.
- Build xml-tree structures with convenient reusable routines from data in your application, and or modify values in read-in trees.
- Write-out valid xml-files automatically from xml-trees that were constructed or read-into memory by your application.
- Check xml-trees against an arbitrary xml schema definition (XSD).

Avis client library is a Java API for clients accessing Elvin event routers, including the open source Avis event router and the commercial Mantara Elvin product.
Avis is an event router service compatible with the commercial Elvin implementation developed by Mantara Software. Avis provides a fast, general-purpose publish/subscribe message bus.
Elvin event routers alllow arbitrary messages, known as notifications, to be exchanged via a publish/subscribe model. Elvin clients subscribe to messages published by other clients using expressions that match messages by their content.
The content-based routing approach used in Elvin routers differs from many other message bus systems that operate by selecting messages published on pre-defined channels, and has the advantage of promoting a much higher level of decoupling between producers and consumers of events.
The name "Avis" derives from the French word avis, meaning advice or notification.
Enhancements:
- This release marks a stable baseline for the Java client API.
- The core set of features required for an Elvin client library are now implemented and stable, including subscription, notification, security, close event notification, liveness checking, and router connection option support.

TCB::Library provides a database-backed book library package for DBIx::Frame.

TCB::Library is a DBIx::Frame object written to keep track of library books at the TCB Group at UIUC.

It provides a Web interface for adding books to the library, for users to check out and return them, and for reminder messages to be sent out periodically to list what books are checked out.

This is actually a fairly basic function of research groups, but doesnt have a standard software package.

FF RADIUS Library is a C library that implements some parts of RFCs 2865 and 2866 to provide a RADIUS implementation.
Youre welcome to modify/enhance it! Please let me know of any further developments, in order for me to include/link them.
Enhancements:
- A segfault was fixed in makeMD5().

PHP Exif Library in short PEL is a library that lets you manipulate Exif (Exchangeable Image File Format) data. This is the data that digital cameras place in their images, such as the date and time, shutter speed, ISO value and so on.
Using PEL, one can fully modify the Exif data, meaning that it can be both read and written. PEL is written completely in PHP and depends on nothing except a standard installation of PHP, version 5, which was released on July 13th 2004.
Main features:
- Reads and parses both JPEG and TIFF images.
- Supports reading and writing all Exif tags.
- Supports internationalisation.
- Extensible object-oriented design. PEL utilizes the new features in PHP 5.
- Tested with SimpleTest (11 camera models tested, plus core tests).
- Fully documented with PhpDocumentor, see the online API documentation.

Standard Portable Library is a pointer friendly C/C++ STL substitute. The API is similar to Java or .NET and includes common data structures, networking, and database support.