Scorched 3D is a turn based artillery game. It is open source and is licensed under GPL. The graphics are very nice and the textures are detailed. Gameplay is simple but it takes a while to master the game. The goal of the game is to blow up your opponents but you have to take into consideration angle, rotation and power. There are a lot of different weapons to choose from and each one has a particular function. Some are very powerful so be careful not to blow yourself up or half of the island. Also, it is important to learn different tactics to gain an advantage over your opponents. There is local and network gameplay available. Definitely a fun game with cool 3D graphics.
Scorched 3D website.