Endless Sky: GPL Licensed Escape Velocity Successor

In fact, no matter what ship you choose, if you stray into the wrong parts of the galaxy you’re sure to run into pirates sooner or later. About 50 different models of ships are available in human territory, anything from massive freighters to powerful warships to quick, nimble scoutships. Endless Sky is designed to make it as easy as possible to create new content to add to the game, and people are hard at work on other story lines, as well as new alien species, ships, and outfits.

Source: endless-sky.github.io