Can anyone help me to know the name of a mod  that gives statistics on players, example, most structures upgraded,longest pvp kill, most structures destroyed, most rockets fired?
I played on a server that used that mod and it would randomly show these stats in the server chat.

No mod exists for that. It is a plugin.
It is not maintained on this site, so it can cause errors (give it a try I guess)
Player ranks

Thank you very much for the quick reply, great job!!!