The library is currently in a stable release, suitable for download and incorporation into user projects for both host and device modes. For information about the project progression, check out my blog.
LUFA is written specifically for the free AVR-GCC compiler, and uses several GCC-only extensions to make the library API more streamlined and robust. You can download AVR-GCC for free in a convenient windows package, from the the WinAVR website.
WinAVR Website: http://winavr.sourceforge.net
avr-libc Website: http://www.nongnu.org/avr-libc/
USB-IF Website: http://www.usb.org
* Permission to use, copy, modify, and distribute this software * and its documentation for any purpose and without fee is hereby * granted, provided that the above copyright notice appear in all * copies and that both that the copyright notice and this * permission notice and warranty disclaimer appear in supporting * documentation, and that the name of the author not be used in * advertising or publicity pertaining to distribution of the * software without specific, written prior permission. * * The author disclaim all warranties with regard to this * software, including all implied warranties of merchantability * and fitness. In no event shall the author be liable for any * special, indirect or consequential damages or any damages * whatsoever resulting from loss of use, data or profits, whether * in an action of contract, negligence or other tortious action, * arising out of or in connection with the use or performance of * this software. *
Also included with the library are two fully functional bootloaders, loacated in the /Bootloaders/ subdirectory. The DFU class bootloader is compatible with Atmel's FLIP software or the open source dfu-programmer project, and the CDC class (AVR109 protocol) is compatible with such open source software as AVRDUDE and AVR-OSP.