Editors for Escape Velocity have been created that allow for the creation of third-party universes, missions, ships, weapons, and planets. In fact, a whole new story line can be created for Escape Velocity to provide players with more to explore.
It's not a plug and play kind of thing, but it is very fun once you get the hang of it. First go to:
and download the Plug in Package. This package contains the FAQ for the old Delta - V mailing list, this covers most of the questions regarding plug in making; the EV Bible, which explains the resource indexing for EV, and a sample plug in.
Then go to: