Developers of X-Beyond the Frontier, X-TENSION and Online-Universe.net.
Egosoft is a German-based software development company, who among other things developed and released X: Beyond the Frontier and successive games based on that universe. Among these successor games is X3 Terran Conflict which this wiki hopes to document.
Egosoft maintains their own website.
Additional information about the company can be found in the wikipedia article