Server

This slightly modified vanilla server software has some major fixes while still allowing normal vanilla gameplay:

Chunks load at a maximum rate per player, meaning someone flying super fast cant hang the server.
A certain tp exploit in the vanilla server still fully works but no longer lags out the server.
Joining too fast and connection per ip limits.
Players cannot join with a username already online.
Entity limit per chunk.
32m32m fixes.
Packet limit.

Things not included:

Username authentication (maybe i will add this later).
The nether lags chunk loading to shit and nether farlands crash the server (like vanilla and craftbukkit), i hope to fix this soon.
Theres probably more things i havent fixed yet.