SeaMonkey is an internet suite. It’s the continuation of the former Mozilla Application Suite, based on the same source code, which itself grew out of Netscape Communicator and formed the base of Netscape 6 and Netscape 7. It contains an Internet browser, email & newsgroup client, HTML editor, IRC chat and web development tools.
SeaMonkey’s powerful yet simple HTML editor offers dynamic image and table resizing, quick insert and delete of table cells, improved CSS support, and support for positioned layers. For all your documents and website projects.
SeaMonkey is free and open source software.
Key Features
- Web Browser with tabbed browsing, session restore, add-ons management, data manager, lightweight themes, feed detection, smart location bar, find as you type, safe mode, advanced security settings, download management, web form autocompletion, toolbar customization, and support for the latest web standards.
- Mail & Newsgroups – tabbed mail, junk mail controls, customizable tags and mail views, support for multiple accounts, blogs and news feeds. SeaMonkey Mail & Newsgroups includes enterprise-ready features such as S/MIME, return receipts, address books, LDAP support, and digital signing.
- IRC client – multiple networks and channels are easy to keep track of in a familiar tabbed interface. Change the look and feel of the chat with motifs; choose from several built-in motifs, many more downloadable, or create your own with CSS.
- Web development tools – DOM inspector and JavaScript Debuger.
- Cross-platform – runs under Linux, Mac OS X, and Windows.
Website: www.seamonkey-project.org
Support:
Developer: SeaMonkey Council
License: MPL/GPL/LGPL

SeaMonkey is written in C++. Learn C++ with our recommended free books and free tutorials.
Related Software
| HTML Editors | |
|---|---|
| Zed | Fast, multiplayer code editor built for serious development |
| VSCodium | VS Code binaries without Microsoft branding or telemetry |
| Bluefish | Powerful editor for writing websites, scripts and programming code |
| NetBeans | Java based integrated development environment |
| Pulsar | Community-led Atom continuation for highly customizable editing |
| SeaMonkey | All-in-one internet application suite |
| Phoenix Code | Browser-based editor with live preview and collaborative coding |
| Webstudio | Visual website builder aimed at open, code-friendly design |
| Geany | Lightweight IDE offering speed, simplicity, and broad language support |
| Kate | KDE’s powerful text editor with sessions, projects, and plugins |
Read our verdict in the software roundup.
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