ODA Online Disassembler is described as 'ODA is an online disassembler for a wide range of machine architectures, including: Alpha, ARM, AVR, Intel x86, Motorola 68000, MIPS, PDP-11, PowerPC, SPARC, Z80, and more!' and is an website in the Development category. There are more than 10 alternatives to ODA Online Disassembler, not only websites but also apps for a variety of platforms, including Windows, Linux, Mac, BSD and Cygwin. The best alternative is IDA. It's not free, so if you're looking for a free alternative, you could try OllyDbg or GNU Project Debugger. Other great sites and apps similar to ODA Online Disassembler are Cutter (Free, Open Source), Binary Ninja (Paid), REDasm (Free, Open Source) and Hopper (Paid).
Malcat is a feature-rich binary hexadecimal editor / disassembler targeted to IT-security professionals. It has supports for many file formats and CPUs, can scan for anomalies, decrypt/decompress data, diff files and run python scripts.
Relyze is an interactive software reverse engineering and analysis platform with the following main features: * Load PE and ELF binaries - Navigate a binaries structure and discover how it is composed. Visualize the data and enrich the analysis with symbols.