SeaMonkey
SeaMonkey is a free, open-source internet suite from Mozilla that combines a web browser, email client, newsgroup reader, address book and HTML editor in one application. It is descended from the Netscape Communicator era and has been maintained by volunteer developers since Mozilla split its product line. Users typically choose SeaMonkey for integrated mail and browsing in a single unified interface, or because they have decades of email and filter configurations invested in it.
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1 suggestionSeaMonkey has been discontinued by its developers and no longer receives active maintenance or updates. The project ships only Intel x86_64 builds for macOS with no native Apple Silicon version ever released, and the application faces growing compatibility problems with recent macOS releases. The Intel build currently runs under Rosetta 2, but Apple is removing Rosetta 2 in macOS 28 (September 2028), at which point SeaMonkey will stop launching entirely on any Mac running that release or later. If you rely on SeaMonkey for email, you should begin planning a migration now — Thunderbird is the closest maintained alternative, offering the same email, news and calendar features as SeaMonkey's mail component in a modern, natively compiled app for Apple Silicon. Thunderbird is free and can import your existing mail folders, accounts, filters and address books from SeaMonkey with minimal manual work, making the transition straightforward for most users.
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