** Public Libraries **
- GTLCore: this library provides Core functionnalities, such as debug, or memory buffer (those parts are public, headers whose names contains an "_p" are privates to the library)
- GTLImageIO: library to decode/encode images

** Private Libraries **
- GTLTest: this library implements a test framework, it's use is limited for testing the API of the various OpenGTL components (nothing from GTLTest should be installed)