Hello @ all I'd like to have a FlatWorld genarator, because I Currently do'nt no how I make someone! thanks phi98lipp
What you're asking can be done with about 2-3 plugins. I believe there is a world type that makes flat land that jeb placed in 1.2.3. In server.properties, change level-type from DEFAULT to FLAT. For no mobs, it can be done with WorldGuard. There might be other plugins with less feature. If you want WorldGuard but not WorldEdit (as it is a requirement), just placed the WorldEdit.jar in your server root (folder above the Plugins folder) and Worldguard will detect and use it. For the no night, you should be able to find a plugins that can do it, if you search a little.
Setting the world type to NETHER or END will suppress night and weather, but that's only useful if you're using a custom generator (since otherwise it also changes the generator used); CleanRoom would do the trick, I expect.