This tab groups options that are related to external tools and resources.
The Fonts Editor allows you to define preferred fonts editor and defaults to FontForge that is used on Linux and Mac systems (please bear in mind that principal Fontmatrix developers are GNU/Linux users).
The Help Browser option let's you defining what browser to use for reading this help system. It defaults to Fontmatrix's own help browser that uses Webkit for rendering help pages.
The Hyphenation Dictionary option allows you to define a dictionary for use with sample text. Left and Right options define FIXME.