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.