The Dungeon Crawl Classics Gongfarmer's Almanac is a community resource where creative folks have created their own content and packaged it together into mini zines, which are freely available.
Many of those zines contain new classes for the Dungeon Crawl Classics RPG, and those classes now have sheets that you can use with the Foundry VTT DCC system. You'll still need to get the Gongfarmer's Almanac free zines to have the details of these classes, but the character sheets are available via this module.