You want the latest GCGB and compiler. You are probably new to using microprocessors or have used GCGB in the past.
Simply select the installer to download.
This is the latest build of Great Cow Graphical BASIC and the Great Cow BASIC compiler.
Contains demonstrations and programmers for Microchip and AVR microprocessors. Contains the command line programming tools Microchip Pickit 2 and AVRDude. This is does not include the textual GCB@SYN IDE.