SeaMonkey Description

SeaMonkey is a community-driven, open-source Internet suite that brings together browsing, communication, and development tools under one unified interface. Designed as a successor to the Netscape Communicator and Mozilla Suite, it offers an integrated experience combining a web browser, email and newsgroup client, RSS reader, IRC chat, and HTML editor. Powered by the Mozilla Firefox and Thunderbird engine, SeaMonkey ensures fast performance, tabbed browsing, popup blocking, and secure mail handling. The email client supports S/MIME encryption, adaptive spam filtering, and LDAP-based address books for professional-grade communication. Developers benefit from built-in tools such as the DOM Inspector and support for numerous add-ons to extend functionality. The suite runs across Windows, macOS, and Linux, maintaining a consistent experience for diverse users. With regular updates and multilingual support, it continues to evolve while preserving the stability of a classic Internet toolkit. Whether you’re managing mail, building websites, or simply browsing, SeaMonkey delivers power, privacy, and versatility in one streamlined package.

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Pricing

Pricing Starts At:
Free
Pricing Information:
Open source
Free Version:
Yes

Integrations

View Integrations

Reviews - 2 Verified Reviews

Total 5 out of 5 stars
ease 5 out of 5 stars
features 5 out of 5 stars
design 5 out of 5 stars
support 4.5 out of 5 stars
See More Reviews for SeaMonkey Write a Review

Company Details

Company:
SeaMonkey
Headquarters:
United States
Website:
www.seamonkey-project.org

Media

SeaMonkey Screenshot 1
SeaMonkey Screenshot 1
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Product Details

Platforms
Windows
Mac
Types of Training
Training Docs
Customer Support
Online Support

SeaMonkey Features and Options

SeaMonkey User Reviews

Write a Review
  • Name: David E.
    Job Title: User
    Length of product use: 2+ Years
    Used How Often?: Monthly
    Role: User, Administrator
    Organization Size: 1 - 25
    Features 5 out of 5 stars
    Design 5 out of 5 stars
    Ease 5 out of 5 stars
    Pricing 5 out of 5 stars
    Support 4 out of 5 stars
    Likelihood to Recommend to Others 8 out of 10

    I use SeaMonkey Composer. Over 20 years.

    5 out of 5 stars Date: Oct 04 2025

    Summary: Very good, over 20 years of regular use. Every year or so I look for a modern replacement, and don't find one that comes close.

    Positive: I'm not an HTML / CSS/ ... person, but I have built and maintained my personal sailing / nerd web pages (40 different pages, and counting) for many years, using only SeaMonkey Composer. WYSIWYG make it super easy to use. And free. I don't use the other SeaMonkey tools, just the editor.
    It is the successor from Netscape, so lots of history.

    Negative: I'm sure there are better and more modern tools for making simple web pages, but none as easy and cheap as SeaMonkey. I can't make fancy, active web pages with it. I use external blogs for that, and just include links. Same with Youtube videos.

    Read More...
  • Name: Anonymous (Verified)
    Job Title: Software Developer
    Length of product use: 2+ Years
    Used How Often?: Daily
    Role: User
    Organization Size: 100 - 499
    Features 5 out of 5 stars
    Design 5 out of 5 stars
    Ease 5 out of 5 stars
    Pricing 5 out of 5 stars
    Support 5 out of 5 stars
    Likelihood to Recommend to Others 10 out of 10

    Recommended All-in-One Internet Application Suite

    5 out of 5 stars Date: Jun 26 2020

    Summary: SeaMonkey is a free & simple application suite comprising of a browser, email client, IRC chat client, HTML Editor and web development tools. It is quite powerful tool-set and is free to use.

    Positive: Complete suite of applications for internet usage
    Free to use
    Lightweight feature rich browser based on Firefox
    Email & IRC Chat client
    Composer - powerful HTML editor
    Regular Updates
    Large number of add-ons, themes & extensions
    Great community support

    Negative: It is excellent - simple and powerful - for those who just want pure functionality. It is not widely popular due to its old look and no marketing.

    Read More...
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