TotalFinder - TotalFinder is a plugin for Finder.app which adds tabs like in Chrome browser, dual panels similar to TotalCommander and more tweaks.

StoryMill - Developers and publishers of Mac, Win, and iOS productivity, home and office and writing software such as MacGourmet, Paperless and many more. Based in MN.

Path Finder - The Finder, reinvented. Path Finder is an award-winning file browser and management application for Mac OS X.

BlankPage - Stay motivated to write, and finish your story

Forklift - The most advanced dual pane file manager and file transfer client for macOS.

Manuskript - Open-source tool for writers.