IDA is described as 'A disassembler and decompiler with robust support for various processors and file formats, offering pseudocode similar to original source code' and is a popular Decompiler in the development category. There are more than 25 alternatives to IDA for a variety of platforms, including Windows, Linux, Mac, BSD and Haiku apps. The best IDA alternative is Ghidra, which is both free and Open Source. Other great apps like IDA are x64dbg, radare2, Malcat and GNU Project Debugger.
Ghidra is a software reverse engineering (SRE) framework created and maintained by the National Security Agency Research Directorate. This framework includes a suite of full-featured, high-end software analysis tools that enable users to analyze compiled code on a variety of...
x64dbg is a 64-bit assembler-level debugger for Windows. The corresponding 32-bit debugger is called x32dbg.
Radare project started as a forensics tool, a scriptable commandline hexadecimal editor able to open disk files, but later support for analyzing binaries, disassembling code, debugging programs, attaching to remote gdb servers, ...
Malcat is a feature-rich hexadecimal editor / disassembler / decompiler for reverse engineers and malware analysts. It has support for many file formats and CPUs, can scan for signatures, decrypt/decompress data, diff files and run python scripts.
GNU Project Debugger, or gdb, is a command-line, source-level debugger for programs that were written in C, C++, D, Objective-C, Fortran, Java, Pascal, assembly, Modula-2, or Ada and compiled for any of a number of different target architectures including x86, x86-64, IA-64...
Radare, the highly featured reverse engineering framework. NOTE: it is better to use the "radare 2", not the "radare".
Features
Multi-architecture and multi-platform GNU/Linux, Android, *BSD, OSX, iPhoneOS, Windows{32,64} and Solaris i808.
OllyDbg is a 32-bit assembler level analysing debugger. Emphasis on binary code analysis makes it particularly useful in cases where source is unavailable.
Rizin is a feature rich reverse engineering framework in development, focusing on stability and high code quality, a welcoming and curious community culture and implementation of cutting edge binary analysis research.
Hopper is a reverse engineering tool for OS X and Linux, that lets you disassemble, and decompile your 32/64bits Intel Mac, Linux, Windows and iOS executables!
Cutter goal is to be an advanced FREE and open-source reverse-engineering platform while keeping the user experience at mind. Cutter is created by reverse engineers for reverse engineers.
WinDbg is a multipurposed debugger for Microsoft Windows, distributed on the web by Microsoft as part of the Debugging Tools for Windows. It can be used to debug user mode applications, drivers, and the operating system itself in kernel mode.
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The tool has a graphical interface. It is open source software, and I never thought that such a large organization would make such a major contribution to the development of free software and other similar programs for the community.