This is Linux software for PG302 programmer for AVR and x51 family of microcontrollers.
This software is for people who still own PG302 programmer and want to use excellent compilers like SDCC and GCC on Linux OS or maybe just upload hex file to microcontroller.
PG302 programming interface/protocol (PG302-->microcontroller) is outdated and incompatible with new range of microcontrollers. Some microcontrollers are not available on market any more such as AT89S8252 from Atmel.
There are still quite a few microcontrolers supported by this programmer like very popular x51 microcontroller AT98c2051 and others.You can get whole list of supported microcontrollers on HOWTO page.
Firmware for AT89c2051 on board of PG302 programmer isn't available publicly. I wish owner (whoever this might be) decides to donate this code to others.