Provide tools for translation and display of text in multiple languages and support for regionalization/localization for dates, numbers, currency, measurement, or other local contexts.
i19n is a extension module that adds support for things like price and date format localisation. This is not just one module but a suite of modules.
This module automatically translates stored Drupal content through the use of third-party translation API's.
Integrates Entity Translation with Panels IPE. This would probably work with i18n as well, but I haven't tested.
If you want to take over this project, see Project ownership transfer.
Drush command for synchronizing translations between DTAP environments.
This drush extension provides 3 drush commands:
"Domain Language" Add a new detection/selection method on the language selection and it allow to set the default language for a specific domain.