Electron Toolset

The Electron toolset was developed by Obsidian Entertainment and is included in the role-playing video game Neverwinter Nights 2. It allows people to design their own adventures (known as a module) and distribute them for others who own the game to play. It is an evolution of the Aurora toolset which was created by BioWare and used for the original Neverwinter Nights game and was completely re-written using the C# programming language.

Modules created with the toolset can only be loaded with either the client application or the server application provided and can be used for single-player, multi-player or persistent worlds. However, while modules can be created for persistent worlds, it was never intended for this purpose and is not directly supported by Obsidian. The module itself is stored in a proprietary .mod format which was created for the original and has not significantly changed since then.

Read more about Electron Toolset:  Toolset Components, Features, Improvements Over The Aurora Toolset