Open Source Mailing List Software
Examples
- PHPlist - a free open source application with internationalization (aka multi-ligual) features. I've used this tool with success before, but getting appropriate support and hosting (that won't be blocked by spam filters) requires further investigation.
- CiviCRM - another open source tool designed for campaign management with extensive features for tracking online and offline communications with a mass consituency. I can't vouch for the mutli-lingual support but there are people in Ottawa working who may have some success.