From Demeter of the Kernel.org

• rt - RTwiki
• ext4 - Ext4
• btrfs - btrfs Wiki
• ata - ata Wiki
• ieee1394 - IEEE 1394 FireWire Wiki
• security - Linux Security Wiki (obsolete)
• i2c - Linux i2c Wiki
• parisc - Linux PARISC Wiki
• reiser4 - Reiser4 FS Wiki
• perf - Perf Wiki
• hail - Hail Cloud Computing Wiki
• sparse - Sparse Wiki
• kgdb - KGDB Wiki
• modules - Linux Kernel Modules Wiki
• ckpt - Linux Checkpoint / Restart Wiki
• raid - Linux Raid Wiki
• git - Git SCM Wiki
• dracut - Dracut Wiki
• backports - Driver Backports Wiki
• llvm - LLVM Linux Wiki (not hosted by kernel.org)
• wireless - Linux Wireless
• hwmon - Linux hwmon Subsystem Wiki
• v4ldvb - V4L/DVB wiki - Linux Media Input Infrastructure (not hosted by kernel.org)
• apparmor - AppArmor Wiki (not hosted by kernel.org)
• mon - Mon site (not hosted by kernel.org)
• korg - Meta wiki about the kernel.org infrastructure
• bottest - Linux Kernel bot tests
• xfs - The XFS Linux wiki