Cultivation 7 is also available. This is an interesting and original game, but I don't think I can beat the Freshmeat description so here's a quote:
You lead one family of gardeners, starting with a single individual, and wise choices can keep your genetic line from extinction. While breeding plants, eating, and mating, your actions impact your neighbors, and the social balance sways between conflict and compromise. Cultivation features dynamic graphics that are procedurally-generated using genetic representations and cross-breeding. In other words, game objects are "grown" in real-time instead of being hand-painted or hard-coded. Each plant and gardener in the game is unique in terms of both its appearance and behavior.
This is the type of game that just couldn't be made commercially as it's not going to sell [where's the violence or thrills?] but at the same time it is completely fascinating and full of potential.