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Mozilla Projects

• MailNews - For all MailNews code that overlaps between SeaMonkey and Thunderbird.
• SeaMonkey - "A community effort to develop the SeaMonkey all-in-one internet application suite."
• Calendar - Calendaring add-on for Thunderbird known as Lightning, stand-alone product Sunbird.
• Raindrop - An exploration in messaging innovation

Other Projects

• Correo - Correo "blends technology from two popular Mozilla projects, Camino and Thunderbird, to create a polished native Macintosh application."
• Penelope - Penelope is an open source extension to Thunderbird based on Qualcomm's Eudora mail client.
• Spicebird - A collaboration suite based on Thunderbird (discontinued).