Pure Vanilla Server. Difficulty high. To add to the whitelist, send mail to konstantin@morozov.us. No cheating only.
Minecraft is a benchmark in the genre of MMORPG. Unofficial builds of server with plugins violate this benchmark. The main problem is cheaters. It is unfortunate that Mojang not attempt to correct this situation in the official server assembly. Really, Im tired of messing around with plugins and fight cheaters. Therefore, only the legal copy and only the whitelist.