Immunity debugger allows you to reverse engineer binary files. It’s also used to analyze malware and write exploits as well. The tool comes with python API, which means you can write your own extensions using python. The program is one of the most commonly used debugger because it is reliable and comprehensive. It is very easy to use and provides both GUI and CLI. You simply open the executable file.
The software will have disassembly, registers, dump, and stack details provided to you on the screen and through these you are able to see changes immediately and see how it affects the program. It provides lot of different insights and provide valuable context. Other tools you may use are olly debugger, windbg, IL spy, and radare2.