LuminousFort began as an open source clone of Sourceforts. However, the developers realised that much more than open source clone of Sourceforts was required to revive the gameplay people once loved. A new game that was vastly different from Sourceforts had to be made and they went to the drawing board. The mod is still using the Source SDK, but is open source. This is made possible by a differential system that separates the LuminousForts code from Valve's Source SDK code, so the LuminousForts code can be redistributed.