NOTE: There is a known issue with the most recent entries having screwed-up information and links. Some databases are out of sync and we haven't been able to fix it yet.
Onslaunch is a really cool way of starting Doom II single- and multi-player games(primarily multi-player games). It is basically, a replica of the Doom II "ESC" menu that lets you start single player games using the normal "New game", "Load game" etc. menus, and multi-player games using an extra "Multi-player" option that replaces the "Save game" option.