From ReactOS

This page contains the masterlist of all the considered subsystems for ReactOS and their current status.

• Session Manager (SM(SS))
  • Working but incomplete
• Win32
  • Actively in progress

Abandoned subsystems

• ROS/2 (OS/2)
  • Unknown
• PSX
  • Stalled (waiting for the new C/S runtime)
• VMS
  • The source code was removed from repo in r36843.