Space Exploration: Serpens Sector is a very long-running project to make a space exploration game in the vein of Strange Adventures, Star Control, and others. It's gone through a number of iterations and refinements over the years. In its current state, it is now gameplay-complete. The gameplay focuses on making interesting decisions balancing risk, reward, limited resources, the morale of your crew, and your reputation with the alien factions of the sector. The gameplay does not focus on combat.
The Cog Engine Project is a software suite aimed at simplifying the creation of video games. No prior programming experience is necessary. The project's goal is to make building a video game easy enough for a motivated child to understand, while remaining as flexible and powerful as possible for the advanced user.
HLA Adventure is an adventure game that was written in Randy Hyde's HLA language. It features Mippy, a cute dragon that lives happily in the forests and caves and often comes out during the later part of the day to eat leaves, smoulder decaying trees, and generally romp around like every good dragon should.