PE Explorer, WinHex, Ghex, 010 Editor, Okteta, ImHex, wxMEdit, RJ TextEd, Bless, Binary Ninja, iHex, Hiew, 0xED, HexEd.it, Hexinator, Free Hex Editor Neo, MadEdit, XVI32, Malcat, Hex Fiend, Kaitai Struct, Active@ Disk Editor, Hex Workshop, Batch Hex Editor, MiTeC HexEdit, Preon, wxHexEditor, Heraia, BinHex CryPactor, MadEdit-Mod, Climacs, Hexplorer, Hecate, Hexer, FlexHex, FileInsight, EverEdit are some alternatives to HxD.