Shiftit - fikovnik has 62 repositories available. Follow their code on GitHub.
TotalFinder - TotalFinder is a plugin for Finder.app which adds tabs like in Chrome browser, dual panels similar to TotalCommander and more tweaks.
WindowGrid - Quickly and easily layout windows on a dynamic grid using just the mouse.
Path Finder - The Finder, reinvented. Path Finder is an award-winning file browser and management application for Mac OS X.
Moom - Move your mouse over the green zoom button in any window, and Moom's mouse control overlay will appear (as seen in the above animation).
ImageOptim - Faster web pages and apps.