NObjective is a Mono to Cocoa bridge.

NObjective is high-performance bridge between managed .NET and unmanaged Cocoa worlds. It provides automatically generated proxies for all Objective-C classes and can be used to export managed classes to unmanaged Objective-C runtime.

Key features:

• Lowest processor and memory overheads compared to similar bridges; see project page for performance benchmark results
• Ability to automatically import Objective-C classes
  • Essential enums and structs are also automatically imported
• Ability to export .NET Framework classes to Objective-C runtime
• Ability to rethrow exceptions across runtimes in both directions
• Ability to work on Mac OS X Tiger, Mac OS X Leopard