Nikolaos Anastopoulos

This plugin operates transparently, always loading the homonymous jQuery script that automatically replaces uppercase accented characters. The script operates automatically on the document ready event, by selecting all the elements having their text content uppercase transformed through CSS, and by replacing the accented characters in them by their respective non-accented.
Currently the script upstream supports only greek text. Plugin versioning follows upstream versions.

jQuery Remove Uppercase Accents

Automatically replaces accented characters (currently greek) from elements having their text content uppercase transformed through CSS.

OzTheGreat

Improves upon the default WordPress filename sanitizer to remove all non-latin special characters and accents for all new uploads, media and attachments.

WPArtisan Filename Sanitizer

Sanitize media filenames to remove non-latin special characters and accents

jQuery Remove Uppercase Accents vs WPArtisan Filename Sanitizer