Game: Left 4 Dead 2
Type: Mod, Feature, Source-Mod Plugin
Developer: Me

Role: Gameplay Engineer
Engine: Source
Language: SourcePawn
Tools: Matchmaking Extension Interface

This plugin allows players to vote for the next campaign by using a command. It uses an extension that exposes the game's matchmaking interface and reads all campaigns of a server based on the current game mode. This gets rid of the overhead of having to manually add each campaign, especially custom ones. It also uses the built-in game vote screen you see on the left in-game.