General

• The Robert E. Howard United Press Association (REHupa)
  An amateur press association dedicated to the study of REH and his writings
• Project Pride & Howard Museum
• Howard Works
  Extensive REH bibliography
• The Cimmerian
  A journal dedicated to the life and writings of REH (has an REH blog, too).
• The Dark Man
  A bi-annual academic Robert E. Howard journal
• REH: Two-Gun Raconteur
  A Howard journal

• Wandering Star
  Conan, Solomon Kane, Bran Mak Morn
• Del Rey
  Conan, Solomon Kane, Bran Mak Morn, Kull
• Bison Books
  Fantasy, Horror, Westerns, Oriental stories
• Chaosium
  Cthulhu
• Wildside Press
  Ten-book series "The Weird Works of REH" and more