Multiplatform C++ libraries. 1. xmt: Portable programming interface to build MultiThreaded (MT) applications or libraries; 2. sockios: interface to sockets (C++ IO streams); 3. StEM: finite state machine/communication framework (communication with ev

A 2D Game Framework, written in C++. Uses SDL as the window manager and Event handler, and OpenGL as the render engine.

So the hard dependencies are:
OpenGL
SDL
SDL-image

By no means completely functional or useful, but its an attempt, whilst I am learning C++....

This is a library designed to help C++ developers in creating Windows application to translate it on world languages. Project contains an utility to convert existing resources of application in PO-file and adds ability to use translated PO-files to application itself without gettext using. The PO-file is a native format of poEdit (a very convenient application for translators)....

YAGF is a graphical front-end for cuneiform OCR tool. With YAGF you can open already scanned image files or obtain new images via XSane (scanning results are automatically passed to YAGF). Once you have a scanned image you can prepare it for recognition, select particular image areas for recognition, set the recognition language and so no. Recognized text is displayed in a editor window where it can be corrected, saved to disk or copied to clipboard. YAGF also provides some facilities for a multi-page recognition (see the online help for more details)....

PCSX-ReARMed is a PlayStation 1 Emulator,

KCemu is an emulator for the KC85 homecomputer series and other Z80 based microcomputers like Z1013, LC80, Polycomputer 880 and BIC A5105. The emulation supports a number of additional hardware, e.g. floppy disk drives and extended graphic modules.

LGPL linux lib,

Wally is a Qt4 wallpaper changer, using multiple sources like files, folders, FTP remote folders, Flickr, Yahoo!, Panoramio, Pikeo, Ipernity and Photobucket images. It runs under Linux, Win32, and MacOSX (experimental), and it's available in many languages....

HTTP server implementation as a library,

Kyua (pronounced Q.A.) is a framework to easily develop and execute automated tests for software projects.

Kyua is intended to be a replacement for the Automated Testing Framework (ATF). The code base of ATF is very hard to extend and the overall design of the tools make it impossible to implement some features highly desired by users. Kyua will start by replacing the runtime tools atf-run and atf-report with a single, integrated CLI binary, and later will provide replacements for the C, C++ and Shell bindings....