The community dedicated to one of oldest D&D settings: DarkSun and all relevant things.

Some materials:

• Player’s Guide by Lixu, OSE version
• DM’s guide by LIXU, OSE version
• Atlas of Athas by Overlord1024
• City States by Overlord1024
• Society by Overlord1024
• Magic & Powers by Overlord1024
• Creatures by Overlord1024

Some rules:

• As per usual: be excellent to each other
• If it seems like it belongs to Athas, it is suitable for this community
• Discussions concerning adjacent settings, like Al-Qadim or Ultraviolet Grassland are also permitted