Yes it is a plugin, and the client mod is a add-on which can be used for your server or just single player.
Hello could i be one othose testers for the realcraft mod or is it a plugin i dont know could you also tell me is this like bukkitcontrib like it is beter with the cliant mod installed
Okay. Realcraft is a stand-a-lone bukkit plugin. ALSO coming in client mod form. Hence the client mod features. The project is not completed, nor near completeion. I'll have BETA testers probably sometime next week. If you're still interested by then I'll send you a PM. Thanks for your interest in realcraft.