TotalFinder - TotalFinder is a plugin for Finder.app which adds tabs like in Chrome browser, dual panels similar to TotalCommander and more tweaks.
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
Path Finder - The Finder, reinvented. Path Finder is an award-winning file browser and management application for Mac OS X.
ImageOptim - Faster web pages and apps.
Forklift - The most advanced dual pane file manager and file transfer client for macOS.
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.