 The latest version is the Serious Engine 4, which Croteam used in their most recent game, "The Talos Principle".In March 2016, Croteam released Serious Engine v1.10 as free and open source software on GitHub under the GNU General Public License v2.In November 2001, Global Star Software announced the completion of a Palm OS version of "The First Encounter" developed by InterActive Vision, to be released in early December.