Pre-release software is built using actively developed sources. Binaries are built nightly, and minute-by-minute changes are available through Development Repository.

Option 1: Installer

Distribution:    Platform+Type:   
[static table]
(version 5.3.4.10, updated at Friday, May 24 2013, 03:30 EDT)
Installers:  
Racket
Same as the normal distribution, containing the basic systems and DrRacket.
Racket Textual
A small distribution that contains only Racket and console applications based on it, including the Racket web server. No docs and no GUI applications.
Racket Full
Contains the complete Racket tree from the repository, including full documentation, full source tree, libraries that are not completely stable, and esoteric material.
Note: the default installation directory contains the version number to avoid clobbering a normal installation. (Under Windows, registry names are different, too.)

Option 2: git Repository

Full source is available from the repository.

Option 3: Other

Want Racket sources from Development Repository but don't want to build binaries? Want to browse a Development Repository checkout? The nightly build page has everything you could want.