Decompilers, hex editors

IDA is a Windows, Linux or Mac OS X hosted multi-processor disassembler and debugger.

radare is a portable reversing framework

binary ninja: A NEW KIND OF REVERSING PLATFORM

Hopper Disassembler, the reverse engineering tool that lets you disassemble, decompile and debug your applications.

Ghidra: A software reverse engineering (SRE) suite of tools developed by NSA’s Research Directorate in support of the Cybersecurity mission

JEB Decompiler by PNF Software

VELES — New open source tool for binary data analysis

HexEd.it, the powerful online hex editor running in your web browser

VBinDiff (Visual Binary Diff) displays files in hexadecimal and ASCII (or EBCDIC)

PortEx is a Java library for static malware analysis of Portable Executable files.

binvis.io — visual analysis of binary files.

Kaitai Struct — a new way to develop parsers for binary structures

IceBuddha — a general purpose binary file parser

010 Editor: World’s Best Hex Editor

Synalyze It! — Hex Editor for Mac

Hexinator — THE UNIQUE PROFESSIONAL HEX EDITOR

SBuD is an experimental playground related to file formats parsing and visualization.