The following projects concern the open-world block game minecraft. Most projects are Bukkit plugins and published on the Spigot forum.
2048
Slide tiles with values and add them up.
Battleship
Two player GameBox game. Sink your opponent's ships before he sinks yours.
Calendar Events
Configure dates and times at which a custom event is called.
Connect Four
Two player inventory game. Create rows of four while keeping your opponent from doing the same.
Cookie Clicker
Bake cookies and rule the world.
GameBox
Provides a GUI for many inventory games.
GemCrush
Inventory game inspired by Candy Crush.