bUtils

Utility plugin for Bukkit.

Server owners:
If you have a plugin that depends (requires) this plugin, just install it! No configuration to be done. Just drag and drop it into your plugins folder.

Developers:
Oh hey, one of my species! Welcome.
This plugin gives you loads of functionality, and basic things you don't want to implement over and over again.
Other than that this plugin also includes a bunch of useful managers, such as player visibility managers. This means that one plugin controls the visibility of a player (which players they can/can't see and by which players a player can/can't be seen) and other plugins use the manager. That prevents weird glitches when multiple plugins are adjusting player's visibility.
Now, you could just reset player's visibility in your plugin and don't bother requiring this plugin, but you don't want to make sure you do that every time, and besides, if someone has 2 plugins that has this kind of approch they will cancel eachother out and it will become a mess again.

Other than a visibility manager, the plugin also comes with an easy to use database connection, which means the server owners only need to setup the database login details once for this plugin and other plugins can use those to their needs, and it also includes an easy to use database connection manager. The manager will prevent any SQL injection, using the native Java functions.

But the plugin also includes little managers like an inventory manager (good for easily creating GUI's), a "custom block" manager, which allows certain players to see a block (and detect clicking on them) which will be invisible/another block for other players, and much more.