https://bitbucket.org/MobiusDev/l2j_mobius/src/master/L2J_Mobius_C1_HarbingersOfWar/
As L2jServer it is not complete. Not all skills and no systems like sieges are implemented.
But you have the server sources with latest c1 datapack to work on anything, if you are up to the task.
Additionally done:
-PvP / PK system.
-Fixed cast animations for most skills.
-Somewhat of water support.
-Distance check for merchants.
-Login with multiple clients on the same computer.
-Fixes like SoE working as intended.
Anyways, I think it is not wort