Following the 2002 source code release by Volition, the community-based FreeSpace 2 Source Code Project (SCP) was formed to continue improving and adding new features to FreeSpace 2. The result is FreeSpace 2 Open, which significantly expands the modding capabilities of the engine as well as providing multi-platform support and greatly improved graphics.
As of the 19.0 release, PXO support has been added to FreeSpace 2 Open replacing the old FSNet (FS2NetD) service. Although most mods released for FreeSpace 2 Open do not include multiplayer support, PXO attempts to support any mod or total conversion which does.
Although FreeSpace 2 Open is freely available, as are an ever growing list of mods, for most mods a full version of FreeSpace 2 is still required. However, some total conversions do not require the any data from FreeSpace 2 and as such are available entirely for free.
Knossos is an installer and launcher for FreeSpace 2 Open which makes it easy to install FreeSpace 2 Open, the original FreeSpace 2 data files, as well as the many mods that are available. Please see the following guide for help getting started with Knossos and FreeSpace 2 Open: