Rabbit is written in C# and is based on the Rhino & Grasshopper SDK. The code will be published on github so that anyone will be able to contribute and help improve the plug-in. We will also remove all limitations related to the grid size.
Adding more features is also on the todo list, so if you have any specific requirement in mind – share it in the comments bellow or on the Rabbit page.
Open sourcing will happen gradually as we need to review the current codebase and update it for the latest versions of Grasshopper and Rhino. Stay tuned for updates!