Crowdin - Localize your product in a seamless way
Vectorizer.io - Fast and easy way to vectorize an image online
POEditor - The translation and localization management platform that's easy to use *and* affordable!
potrace - Open source program that transforms bitmaps into vector graphics.
Lokalise - Localization tool for software developers. Web-based collaborative multi-platform editor, API/CLI, numerous plugins, iOS and Android SDK.
Autotracer.org - Free online image vectorizer