Desura Parser

  1. Login on Desura
  2. Open view-source:
  3. Ctrl+A, Ctrl+C
  4. Ctrl+V in the left form

  5. Login on Steam
  6. Open view-source:
  7. Ctrl+A, Ctrl+C
  8. Ctrl+V in the right form

Please note that Steam games are compared by their name, so it may not be perfect.

Also make sure you load both XML urls with view-source: otherwise it won't work.