A proprietary engine developed by Infinity Ward for the Call of Duty series. Modified versions are used by Treyarch, Raven Software, etc for their respective Call of Duty titles.
Games made in IW engine9 total
This is a new feature, and as such more games are being connected with engines all the time.
Please be patient with us! If you'd like to suggest something we're missing, please let us know in the forums!