Below is a working list of publishers of Tabletop RPG Material. Please add to and update this list as things change.

Key:

   [MAG] prints a magazine
   [BK] prints books
   [PDF] produces an electronic product
   [OGL] develops supplemental d20 material, in accordance with the Open Gaming License
   [4e] develops for D&D 4th Edition
   [PF] develops for Pathfinder
   [AGE] develops for AGE
   [In] develops an in-house system, as opposed to supplemental material
   [Sub] allows outside submissions
   [FL] pays for FreeLance work
   [FT] employs people full time
   [Ac] actively developing new content

• 4Winds [BK][PDF][PF]
• Alderac Entertainment Group (CA) [BK][OGL][In][FT][Ac]
• Baldman Games
• Blackbyrne Publishing [BK][PDF][4e][PF][Ac]
• Catalyst Game Labs [BK][PDF][Ac]
• Claw Claw Bite [PDF][4e][PF][Ac]
• Cubicle 7 (UK) [BK][PDF][FT][FL][Ac]
• Dark Light Interactive[4e][PDF][Ac]
• Dream Pod 9
• Eden Studios [BK][PDF][In][Ac]
• Eos Press
• Evil Hat Productions [Sub][In][Ac]
• Fantasy Flight Games [BK][Ac]
• Far Future Enterprises
• Fire Mountain Games [PDF][PF][Ac]
• Frog God Games [PDF][OGL][In][Ac]
• Green Ronin Publishing [BK][PDF][AGE][FL][In][Ac]
• [http://www.interactionpoint.com/|Interaction Point]] [BK][PDF][PF][In][Ac]
• Jon Brazer Enterprises [BK][PDF][PF][Ac]
• Kobold Quarterly/Open Design [4e][PF][AGE][Sub][PDF][MAG][FL][Ac]
• Malhavoc Press
• Magpie Games[In][Ac]
• Margaret Weis Productions [BK][PDF][FL][In][Ac]
• Mongoose Publishing [BK][PF][Ac]
• Paizo [BK][PF][PDF][FL][In][Ac]
• Pelgrane Press
• Pinnacle Entertainment Group [BK][PDF][In][Ac]
• PostMortem Studios [PDF][Ac]
• Privateer Press
• Rite Publishing
• Steve Jackson Games [FT][BK][In][Ac]
• Super Genius Games [PDF][4e][PF][OGL][Ac]
• Taurus Twelve [PDF][4e][PF][Ac]
• Triple Ace Games
• White Wolf Publishing [FT][BK]
• Wizards of the Coast [4e][FT][BK][Sub][FL][In][Ac]
• Ye Olde Gaming Companye [BK][PDF][In][Ac]