Dungeon Crawl Stone Soup

Why Dungeon Crawl Stone Soup is an excellent roguelike game:

• It is easy to go online and try it out.
• A clear and coherent game design philosophy.
• Deitys with a variety of different themes, such as Sif Muna, the god of magic.
• Loads of different races that require different playstyles, such as felids and octopodes.
• Flexible skill training, allowing you to develop and change your character as you progress.
• Interesting monsters for each stage of the game.
• Prevention of grinding strategies.
• Lategame monsters that are still threatening, forcing players to adapt or die.
• A supportive community that is willing to give advice to help you become a better player.
• It is actively being developed.

<Elynae> summon ice beast is so damn good
<Elynae> i'll kill cerebov with it to prove that
<Gretell> Elynae the Summoner (L11 HuSu), worshipper of Ashenzari, killed by miscasting Summon Ice Beast on Lair:1, with 7605 points after 18288 turns and 1:21:04.

-Funny last words

If you have time you should learn about and play the game online at crawl.develz.org. Or you can look at the project on github.