Merge pull request #762 from demeshchik/patch-1

Update index.md

Author: kenyonj

collections/game-engines/index.md

@@ -34,6 +34,7 @@ items:
  - xenko3d/xenko
  - lance-gg/lance
  - panda3d/panda3d
+ - OpenXRay/xray-16
 display_name: Game Engines
 created_by: leereilly
 ---