[ctstover]

Are there any known reasonably accurate algorithms for taking all caps English words, and converting it to mixed case?

[maxerickson]

What's reasonably accurate mean? A straightforward way to do it would be to naively convert to sentence case and then run the text through a spellchecker with a corpus of proper words you care about.

[ctstover]

Ah, but do not spellcheckers use the capitalization to detect proper nouns in the first place?

[maxerickson]

Firefox is suggesting I correct phillis to Phillis. So Phillis is in the corpus, phillis is not and phillis is a close enough match to Phillis that it is the first suggested correction.