L2J is an Open Source, Alternative Lineage 2 Game Server written in pure Java for best compatibility.
L2J gives you the possibility to legally host a game server for this popular Korean MMO created by NCSoft.
It is still unfinished (Beta) and some features are still missing, but L2J Dev Team is working hard on implementing them.
A word of warning, this project requires a lot of reading. If reading and learning is not something you wish to do, then you may want to find a different game server to operate. L2J server is not just some pop in a CD and play type game.
As noted above in the logo, this is a developers forum. It is not a place for players to come and solve problems.
Please be sure to read the rules before making a post.