LyX for Linux is a document processor designed for those who want professional output with a minimum of effort--and without having to become specialists in typesetting. The job of typesetting is done mostly by the computer, not you. LyX combines the comfortable interface of a word processor with the high quality of a real typesetting system. LyX uses LaTeX, a typesetting system for a wide range of documents. This download is a gzipped TAR source package.
Publish good doc. Powerful editing features. Suitable for many purposes such as mathematics. One need to be familiar with various commands before becoming a regular user. Fast in Linux only.
Cons
Table setting is messy and unpredictable.
Style is tedious.
Pasting graphic is different.
Need to have many commands handy before one can appreciate the free product.
Summary
I am going to continue to use this free product. It is better than TExmac or others.