Karl Berry Olaf Bachmann and many others.
GNU recode reference manual recode converts files between character sets and usages.
When exact transliterations are not possible, it may get rid of the offending characters or fall back on approximations. This program recognizes or produces nearly 150 different character sets and is able to transliterate files between almost any pair. Most RFC 1345 character sets are supported. The current recode release is 3.4. What is the purpose of this program 2.