Dragon Apps has created titles in several different genres, including the popular online FPS Road to Rage.
Go to the Dragon Apps homepage.
Go to the Dragon Apps games page.

Dragon pong

March Massacre

Old Games with Source

Operation Black Square

Skate Skate

Slender: Lost Vision

The Road to Rage

The Road to Rage Extra Files

The Road to Rage map maker tutorial

Note that this archive also includes a brief key summary for the map maker as well as the tutorial itself.