• International Skat Players Association - Organizes tournaments and promotes the game worldwide, with local chapters in a dozen countries.
• Schafkopf Group - The rules, tactics and variations for the Sheepshead/Skat/Doppelkopf/Schafkopf game family.
• Schafskopf - Rules and strategy for the three-handed game variety.
• Sheepshead Association - Free group offering game rules, glossary, history, and related resources, with tournament and open play news.
• Sheepshead Central - News, tournament updates, event photos, online polls and an active message board.
• Sheepshead Optional Doublers - Optional ways of scoring.
• Steiner's Sheepshead - A weekly tally of results from an ongoing Madison, Wisconsin game begun in 1996.