The GNOME Project is a free and open source desktop and computing platform for open platforms like Linux that strives to be an easy and elegant way to use your computer. GNOME software is developed openly and ethically by both individual contributors and corporate partners, and is distributed under the GNU General Public License.
Of course Apostrophe is on top of the list, especially with 3.0. The new preview mode is awesome for actual markdown work, but for me Apostrophe is just the best non-distractive text editor for the GNOME desktop - if not for the entire Linux desktop.
Great for stream of thought creative writing.