Crowdin - Localize your product in a seamless way
Resizing.app - Image resizing has never been so simple with free online resizing.app. Convert, optimize, resize images with ease and for absolutely free.
OneSky - Full Stack Localization Solution
Squash 2 for Mac - The easiest way to compress and optimize images for the web
Lokalise - Localization tool for software developers. Web-based collaborative multi-platform editor, API/CLI, numerous plugins, iOS and Android SDK.
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.