Can i use WinAVR without cygwin?
Yes, you can. I have quickly tested compilation of all example projects under WinAVR and it is possible. Just install as in the Readme, but skip the install toolchain part (but do install the workspace!) Call the compile and flash scripts with the keyword ‘system’. If you do not want to install cygwin at all, you must perform all steps (placing the files at the right locations, rename the config files, using the correct compiler options etc etc) by hand. I would say, for experts only.