YAMPL - yet another message-passing library
High-level C++ framework to ease game development
OSDL: Object-oriented Simple DirectMedia Layer. OSDL is a high level open source (LGPL/GPL) portable multimedia library, built upon Sam Lantinga's SDL (http://www.libsdl.org). Its goal is to provide a high level C++ framework to ease game development.
General-purpose Portable Open Source C++ Library
The Ceylan library is a Free (LGPL/GPL) General-purpose Portable Open Source C++ Library, offering frameworks and abstractions of lower-level layers to ease software development.
Open Call Center Management is a project focused on one-stop Workforce Management and Business Intelligence for Small to Enterprise scale Contact Centers.