Internationalized Domain Name toolkit 2 (idnkit-2) provides useful
APIs (libraries) for application developers to make softwares
IDNA2008-compliant, and also provides tools for system administrators
to process IDNs appropriately according to IDNA2008 specification.
The idnkit-2 is a toolkit revised by JPRS from the idnkit-1.0
developed by JPNIC, and it is released as an open source
free software modified to comply with IDNA2008.

idnkit-2 consists from its main part written in C and additional
API packages for other languages (Java, Python, and Perl).

WWW: https://jprs.co.jp/idn/index-e.html