Scoreboard

Hold Tab during a game to see a scoreboard for every player:

Rounds	Kills	Deaths	K/D	Self-kills	Biggest hit

A kill goes to whoever last hit the victim within 10 seconds, so knocking someone off the map counts.
Stats reset at the start of each game and work in any game mode.
The host tracks stats and syncs them, so everyone sees the same numbers. Every player in the lobby needs this mod.
The key can be changed in the config (ShowKey).