AVR-Doper is an STK500 compatible In System Programmer (ISP) and High Voltage Serial Programmer (HVSP). It was designed with a USB to Serial adaptor because many of the modern computers don’t feature a serial port. Another cool feature is that the entire design is based on free development tools.
AVR-Doper: [Download Project] - [View Project PDF] - [Via]
Read about a cool usb to serial adapter here : USB to Serial Adapter
