HxD, PE Explorer, WinHex, UltraEdit, Ghidra, 010 Editor, Bless, Binary Ninja, iHex, Hiew, MadEdit, XVI32, Hex Fiend, Active@ Disk Editor, Hex Workshop, MiTeC HexEdit, wxHexEditor, Heraia, BinHex CryPactor, Hexplorer, Hecate, Hexer, FlexHex are some alternatives to Okteta.