ChunkClaim will be a new simple grief protection plugin for creative mode servers. Basically players can claim chunks (a 16x16 plot) just by starting to build in them. It's simple and intuitive. The Chunk is protected against Block Breaking, Water and Lava Flow, Explosions, Piston movement and other griefing methods. Players can own multiple chunks, the number of chunks is limited to prevent block spamming.

Claiming chunks works nearly without commands, but building alone is boring. You can trust other players with a simple command (/chunk trust <player>). And if your building is bigger than one chunk, you can trust players in all of your chunks in a radius (/chunk trust <player> <radius>).
This plugin is still under development. I made this plugin to replace GriefPrevention on my server, because it is too difficult for new players and there is too much unused space between claims. Also, it is hard to delete claims.
Just drop the plugin into your plugins folder, then start the server. The plugin will create a folder for the configuration and the data storage. The plugin is only enabled for worlds listed in the config.yml! Add the worlds you want! - Advanced Configuration

Just place or remove a block in a chunk to claim it. You have to confirm that you want to claim a chunk that is not next to a chunk you own with /chunk claim To prevent landscape griefing, you can't claim chunks by placing water, lava or saplings
| Command | Description |
|---|---|
| /chunk | Displays information about the chunk you are in (Owner, Trusted builders etc.) |
| /chunk credits | Shows your credit count. |
| /chunk abandon [radius] | Abandons the chunk you are in [or all chunks in a radius] |
| /chunk trust <player> | Trust a player in all chunks you own. |
| /chunk untrust <player> | Untrust a player. |
| Command | Description |
|---|---|
| /chunk | Displays additional information about the chunk (last login, status of the chunk) |
| /chunk bonus <player> <+-credits> | Adjust the credits of a player |
| /chunk delete | Delete the chunk you are in. The owner gets one credit back. |
| /chunk delete <player> <radius> | Delete all chunks owned by a player in a radius |
| /chunk deleteall <player> | Deletes all chunks owned by a player. Be careful with this... |
| /chunk ignore | You can build anywhere. The problem is that you don't claim public chunks in this mode. |
| /chunk bonus <player> <+-credits> | Adjust the credits of a player |
| /chunk list <player> | Lists up all chunks owned by a player |
| /chunk next | teleports you to a random claimed chunk (useful for inspections) |
| Permissions Node | Description |
|---|---|
| chunkclaim.claim | Access to all player commands. |
| chunkclaim.admin | Admin commands. |

I'm not a perfect java programmer. PM me if you want to help.