MacPIC - PIC Development System for Macintosh includes PIC disassembler, by MacRobotics.Timo Rossi's - 2 PIC disassemblers with C source.
micros/pic - Contains several PIC disassemblers.
DIS16 - PIC16C5x micro-controller family disassembler, by Arsen Torbarina. $15.
PIC Microprocessors - Pic16c84 Disassembler by Martin Darwin.
GNUPic Disassembler - PIC disassemblers and some more disassemblers.
David Tait's PIC Archive - Nigel Goodwin's programmer S/W (includes disassembler) and many more.
PICsuite - Includes PIC disassembler by Jaffa Software. 99 Pounds.
DJDASM - Disassembler for the 16F84 PIC micro implemented in JavaScript. It has colorized HTML output.