sentence: quark , quake army knife editor , for a variety of engines ( such as quake iii arena , half-life , source engine games , torque , etc. ) quiver ( level editor ) , a level editor for the original quake engine developed solely for the classic macintosh operating system by scott kevill , who is also the developer and administrator of gameranger tile studio general purpose sprite/level editor for game programmers toetag , a level editor for the original quake engine , natively developed on and for the apple os x operating system visual pinball stencyl includes a scene designer module which is used to place tiles , actors , and assign behaviors and settings .