I use these kinds of lists to learn about programs I do not know.
I wonder why SeaMonkey is seldom used or mentioned.
I used Firefox, Thunderbird, Kompozer, and Lightning, but find that SeaMonkey is best for me because I write poems, essays, blog, research.
Firefox and Thunderbird are superb,
but all in one SeaMonkey I find best as the core of my 'office suite,' along with Jarte, Foxit Reader, WordWeb, Mobysaurus Thesaurus, Convert, Fried Babelfish, and Copernic Desktop Search 2.
I've just downloaded PDFCreator to add to my 'office suite.'