Index - O
| oblique | FRP.Helm.Text |
| ObliqueStyle | FRP.Helm.Graphics, FRP.Helm |
| OKey | FRP.Helm.Keyboard |
| Once | FRP.Helm.Transition |
| open | FRP.Helm.Joystick |
| outlined | FRP.Helm.Graphics, FRP.Helm |
| oval | FRP.Helm.Graphics, FRP.Helm |
helm-0.5.0: A functionally reactive game engine.