Mozilla Thunderbird email client

Mozilla Thunderbird is a free, open-source email, newsfeed, chat, and calendar client that is developed by a global community of contributors. Originally launched in 2004 by the Mozilla Foundation, the project was designed as a companion to the Firefox web browser.

Over the years, the brand has transitioned through various management structures within the Mozilla ecosystem. Today, it is overseen by MZLA Technologies Corporation, a wholly owned subsidiary of the Mozilla Foundation. While the core development and management are based in the United States, the software is built and maintained by a worldwide network of developers, making its 'manufacturing' or development a decentralized global effort.