Apps similar to YuHex include ImHex, which is free and open source. Other options are HxD, UltraEdit, 010 Editor and Hex Fiend. Hex Editors like YuHex are a crowded field, with more than 25 alternatives for Windows, Linux, Mac, the web and Android.
JujuEdit is a file editor, or alternatively a text editor with knobs-on. It is an application designed for me and people like me. At its simplest, it makes a fine replacement for Notepad. It may appeal more to computer nerds who like syntax hilighting and advanced find/replace...
Use the built-in hex editor, get MD5, SHA1, SHA256 hashes and Base64 with one click, or change the modified and created dates.
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