"Avernum is a series of computer role-playing demoware video games by Jeff Vogel of Spiderweb Software available for Macintosh and Windows-based computers. There are six canonical games in the series. The first three games in the series are remakes of the Exile series by Jeff Vogel, who owns the company. The last three games, also by Vogel, were released in 2005, 2007 and 2009 respectively. The latter games are entirely original and not a remake of any previous game. The Avernum games, like other Spiderweb Software games, are designed with gameplay and storytelling before graphical elements."
Source: Wikipedia, "Avernum_(series)", available under the CC-BY-SA License.