Suggestions for sanitize-umlaut

The following packages have something in common with the package sanitize-umlaut. The packages are ordered in decreasing similarity.

Package listingsutf8: Allow UTF-8 in listings input
Package inputenc: Accept different input encodings
Package stringenc: Converting a string between different encodings
Package koi8: KOI-8 input support
Package rawprint: Print raw Russian text
Package uspace: Giving meaning to various Unicode space characters
Package context-transliterator: Transliterate text from other alphabets
Package gindex: Formatting indexes
Package index: Extended index for LaTeX including multiple indexes
Package splitindex: Unlimited number of indexes
Package hvindex: Support for indexing
Package imakeidx: A package for producing multiple indexes
Package utf2any: Converting Unicoded text to LaTeX, HTML, etc.
Package convert: Generate Knuthian encoding for text files
Package indxcite: Generate author index based on citations
Package repeatindex: Repeat items in an index after a page or column break
Package unicodefonttable: A Unicode font table generator
Package bxdvidriver: Enables specifying a driver option effective only in DVI output
Package makeidx: Standard LaTeX package for creating indexes
Package latex-indexer: Automate index generation for LaTeX documents
Package multind: Multiple indexes in LaTeX documents
Package fonttable: Print font tables from a LaTeX document
Package xeindex: Automatic index generation for XeLaTeX
Package amsmidx: Support for multiple indexes in AMS Classes
Package robustindex: Create index with pagerefs
Package indextools: Producing multiple indices
Package indextra: Enhanced index typesetting
Package keyindex: Index entries by key lookup
Package seealso: Improve the performance of \see macros with makeindex
Package firstindexletter: Enlarged initials for the first entries of index letter groups
Package idxlayout: Configurable index layout, responsive to KOMA-Script and memoir