Ok, since Nuclear RAT 2.1.0 has been released, I have worked on the bugs that people have pointed me. A lot of plugins has been released, check the forums. There are already three language files on the forums for downloading (Arabic, Portuguese, Italian, Simplified Chinese, Spanish, Dutch).
Visit the forums to either have your questions answered, or to download language files or plugins ;D
The plugin SDK is on forums as well, just download it and if you want, post it on the forums! More plugins the merrier as always ;D