USBasp - USB programmer for Atmel AVR controllers (with WinUSB support)
This is a fork of the USBasp firmware by Thomas Fischl.
The goal of this fork is to add support for WinUSB to USBasp firmware to eliminate the need for third-party USB drivers in Windows, such as libusb0.
In this firmware, a Microsoft OS feature descriptor and WinUSB compatibility descriptor was added. When a USB device with this firmware is plugged in, Windows will automatically load the built-in WinUSB driver.
In order to use the USBasp with WinUSB support, you also need tools that support WinUSB, such as AVRDUDE for Windows.
The original readme.txt can be found here: Readme.txt