HTML/Oct/Hex Decoder : This tool will attempt to revert any type of encoding (including Hex, html, Oct, etc).
UnPHP: A free online service to decode obfuscated PHP code. A good chance to solve your issue.
PHP Decoder: The same as above and still useful (if UnPHP was not successful).
Eval base64_decode: also useful for PHP code
Base64: HEX encode/decode
php_value max_input_vars 4500
php_value upload_max_filesize 40M
Plenty of WordPress frameworks are available on the internet. Most of them built for WordPress theme development. There are frameworks for plugins. Options panel is also available. As WordPress frameworks built for faster workflow, most of the developers depending on frameworks. WordPress frameworks help to standardise development and increases flexibility.