GTS synchronizes electronic cards at the sub-nanossecond level. GTS also triggers the data acquisition of the experiment. Structurally, it is a tree of cards connected by gigabit optical fibers. All the trigger decisions are made in real-time in a central trigger processor. The system is currently in use in the nuclear physics experiment AGATA. Moreover, following this presentation, it has been chosen (with some hardware integration planned) to trigger and synchronize the experiments of SPIRAL2 in GANIL.