MiKTeX, or MacTeX. MiKTeX 2.8 (and 2.9) comes bundled with TeXworks, even in the base installation.

One limitation of TeXworks is, that it does not by itself support multi-stage typesetting, like, for example, PNG or SVG output via intermediate DVI. This is a design choice, because such workflows are considered too advanced for the beginning user. The user has to write a shell or batch script to use such workflows with