It's a free annual contest for games made by independent developers, with the aim of finding out the best indie games from each year. Also, to give the games more exposure, some of them from each week are selected for a public vote. However, this won't affect the final decision made by a jury in October. You can enter games in two categories, which are "pro" and "hobby". Here's where it all happens: www.thegdwc.com.