Looking for a great debugger?

IDA Pro dissasembler is perfect for looking at machine language. Word of warning it is difficult to use, but it is the best in my opinion. It works with different processors as well. It also serves as a dissasembler. This is great for looking at Malware to find it what makes it tick and see which system calls its using. It call also allow you to view HEX. Stacks, jumps, tables it has it all!