This bukkit plugin contains components for developing other bukkit plugins. It offers no new plugin-like features on it's own. It is just a bunch of libraries and features that other plugins can make use of.
Versioning
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It is possible to have more than one version of the mcore plugin installed on your server. Bukkit consider them beeing different plugins. The plugin files will have different filenames such as "mcore1.jar", "mcore2.jar", "mcore3.jar" etc. You should not rename the jarfiles.
When a new version of mcore is released it will take a while before the plugins using it will update. And during that phase you will probably need to have two versions of mcore installed on your server, and that is as mentioned very possible.
The source code is embeded in all the jarfiles for your convenience. There is currently no documantation for mcore. You can learn how to use it by looking at other plugins that do so. [Most plugins by MassiveCraft](https://github.com/MassiveCraft) use MCore. [The Vampire Plugin](http://massivecraft.com/plugins/vampire) is a good example.
This project includes [the MongoDB driver for Java](https://github.com/mongodb/mongo-java-driver/) which has an [Apache 2.0 license](http://www.apache.org/licenses/LICENSE-2.0).