HandBrakeBatch: a fully independent application which uses HandBrake video converter under the hood, and allows you to drag & drop a bunch of files at the same time, and convert them using any of the default HandBrake presets. Custom presets defined in HandBrake are fully supported as well.
html2text is a Python script that converts a page of HTML into clean, easy-to-read plain ASCII text. Better yet, that ASCII also happens to be valid Markdown (a text-to-HTML format).
A simple HTML to ePub converter. You have to give repub a few pointers about where to find, eg, the table of contents, but that means it can handle a wide variety of HTML-formatted documents.
Gnac is an easy to use audio conversion program for the Gnome desktop. It is designed to be powerful but simple! It provides easy audio files conversion between all GStreamer supported audio formats.