Most of todays AVR programmers don’t support the high voltage mode the only widely available possibility beeing the STK500 from ATMEL. HVProg is a redesign of the original STK500 without all components of a development board. It is based on the original ATMEL schematics that are freely available on the net (i.e at avrfreaks.net). The main target was to keep all nessecary functionality to programm all available AVR controllers in every programming mode that the STK500 supports.
I never need-ed high voltage programming so far, so the fact that my AVR MK II doesn’t support high voltage programming doesn’t bother me, because i don’t need it.
HVProg Parallel and serial High Voltage Programmer: [Link]