ABC MICRO: PICabc-visual assembler, disassembler and PIC tutorial provide simple method for programming PIC microcontrollers. [Commercial]
Angelica: Disassembler for SX chips.
DIS16: PIC16C5x micro-controller family disassembler, by Arsen Torbarina. [Commercial]
DJDASM: Disassembler for the 16F84 PIC micro implemented in JavaScript. It has colorized HTML output.
GNUPic Disassembler: PIC disassemblers and some more disassemblers.
Joe's Cat PicDis: A HEX file utility and disassembler for over 125 variations of PIC chips. [Free and commercial versions]
MacPIC: PIC Development System for Macintosh includes PIC disassembler, by MacRobotics. [Shareware]
micros/pic: Contains several PIC disassemblers.
Mikado: A disassembler for pic. Also it can make flowcharts, and output of MPASM or CVASM style. [Freeware]
PIC Simulator IDE: An application that supplies PIC developers with graphical environment for Windows and integrated BASIC compiler, assembler, simulator (emulator), disassembler, and debugger.
PicDasm: An PIC disassembler with limited processor-specific support so far but it does handle the 16C5X and 17CXX instruction sets. By Cosmodog, Ltd. [Open source]