Beta versions of the command-line tools for the Dragon, STK500, AVRISP, AVRISP mkII, JTAGICE, and JTAGICE mkII have been released on http://www.atmel.no/beta_ware site independently from AVR Studio.
For people who want access to those tools without the bloat of the full GUI installation, this 18 MB download is probably a lot easier to swallow than the 75 MB download for the full AVR Studio 4.13 release candidate.