This plugin gives better transliteration of non-ASCII characters in slugs.
This plugin adds IDN support to WordPress. IDN (Internationalized domain name) is a domain name that contains non-ascii characters.
CGML (Celogeek Multi Languages), It’s a plugin that allow you to link many blog in different language together.
WP Yamli allows blog editors and commenters to write Arabic spelling text in English or French and Yamli will convert them.
Substantially increase performance of localized WordPress by caching the translation (l10n) object. Supports multiple languages.
The plugin checks for machine tags with ISBN or ASIN numbers, gets the product data from Amazon, and displays it in the sidebar or in a blog article.
This plugin can easily override the translation of WordPress and any other plugin, in order to customize any text of your WP installation.
Lets WPMU user to select language in backend administration panel.
Allows you to introduce individuals, one per page
Allows you to blog in multi-language, and users to select which to read. Works on every blog UI elements, not just the post.
Automatically sets up the WP language environment based on first part of url. Will setup XML lang attribute + $locale variable.
Manages human translated blogs and allows you to administrate, create contents and moderate comments in your native language.
Allows running multilingual WordPress sites with zero management. Automatically creates and updates translation when you edit.
i15d/i18n Permalinks for WordPress.
Globally translate your jQuery UI Datepicker instances.
Gengo is a full featured plugin that provides multi-language blogging for WordPress 2.5+.
My Review plugin helps you format your post as a review.
Helps you create links between equivalent (but different language) pages between WordPress installations.