NoICE is a "full featured" debugger without the "full figured" price. Features include

• Flash EPROM burning and debugging (ARM7, MSP430, HC12, HC08)
• Source-level debug in C and assembler.
• Directly loads Elf/dwarf/stabs file; Imagecraft DBG files; Intel, Motorola/Freescale, and Tektronix hex files, with various symbol formats; and IEEE 695 files.
• Utilities to extract line and symbol information for use with many other compilers and assemblers including 2500AD and IAR UBROF.
• A disassembler, which may also be used without target hardware.
• A mini-assembler, useful for patching and for typing test code into memory.
• Memory display and editing in hex and high-level formats.
• A virtually unlimited number of breakpoints (except as restricted by hardware during Flash debugging.)
• Hardware-free single step using automatically defined breakpoints.
• Manual or automatic definition of symbols, which may be used in expressions and by the disassembler.
• Manual or automatic definition of C data structures, arrays, and stack-based variables.
• A tabbed layout that makes the most of your screen space. Tabs may also be floated and resized.
• NoICE may be operated via the menu and toolbar, from a command line, or from command files.
• The ability to record and play back files of commands, and to define and use such files as macros with arguments
• On-line help in HTML format (automatically invokes your browser). Use of HTML allows you to annotate and customize the help system to meet your needs.
• Support for the ARM7, 68HC08, 68HC11, 68HC12, MSP430, 8051, Z80, Z180, 6809, 6502, 65C02, 8080, 8085, 8096, and 80196.

Why not download NoICE and see for yourself?