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Rock: Crashed Plane (R2) (http://www.dillfrog.com/games/r2/) is an open source multi-user dungeon (dimension, or sometimes domain) coded in the perl programminglanguage and licensed under the GNU General Public License.
The majority of the code was open-sourced as a courtesy when the original server was taken offline. The codebase is largely abandoned, and has not been updated to follow best practices. Use with caution.