Q: What is it?
A: This is a graphical user interface for the GNU troff typesetting software.
Q: How does it look?
A: Not good yet. Mind to help?
Q: Why would I want to use this?
A: If you need to ask this, you probably don't.
Q: How can I get it?
A: Do you use Windows or macOS? Great: This website has a batteries-included precompiled package for you.
You don't? Just grab the source code from any of the repositories and compile it yourself. Lazarus has a simple button for that.
(I may have lied about the included batteries - groff is not included.)
Q: PDF export does not work, everything else does.
A: Chances are that pdfroff is not in your PATH. Check that on the command line.
If it is but it still does not work, it probably is a bug.
Q: This website is awful.
A: Your question is awful.