Objective Development's USBaspLoader (orig. http://www.obdev.at/products/vusb/usbasploader.html) with my patches.
C Assembly
Latest commit 842ec66 Feb 2, 2010 Peter Zotov Added readme
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README.txt

Rename loaderconfig-DEVICE.h to loaderconfig.h for everything to work.
-usbasp is configured for USBasp programmer pins,
-default is for OBDev.at defaults (D-/D+ on D0/D2, no pullup).

Copy the -default header and modify it if you need a custom setup.