GNUPic Disassembler - PIC disassemblers and some more disassemblers. - http://www.gnupic.dds.nl/disassemblers.html
micros/pic - Contains several PIC disassemblers. - http://margo.student.utwente.nl/el/micros/pic/
Joe's Cat PicDis - A HEX file utility and disassembler for over 125 variations of PIC chips. [Free and commercial versions] - http://www.joescat.com/micro/picchip.htm
Angelica - Disassembler for SX chips. - http://online.dip.jp/angelica/index_e.html
Mikado - A disassembler for pic. Also it can make flowcharts, and output of MPASM or CVASM style. [Freeware] - http://online.dip.jp/mikado/index_e.html
DIS16 - PIC16C5x micro-controller family disassembler, by Arsen Torbarina. [Commercial] - http://fly.cc.fer.hr/~arsen/dis16/
PIC Simulator IDE - An application that supplies PIC developers with graphical environment for Windows and integrated BASIC compiler, assembler, simulator (emulator), disassembler, and debugger. - http://www.oshonsoft.com/pic.html
ABC MICRO - PICabc-visual assembler, disassembler and PIC tutorial provide simple method for programming PIC microcontrollers. [Commercial] - http://www.abc-micro.co.yu/
MacPIC - PIC Development System for Macintosh includes PIC disassembler, by MacRobotics. [Shareware] - http://www.macrobotics.com/MacPIC.html