Poedit - Poedit translations editor. The best way to translate apps and sites.
POEditor - The translation and localization management platform that's easy to use *and* affordable!
Weblate - Weblate is a free web-based translation management system.
Visual Studio Code - Build and debug modern web and cloud applications, by Microsoft
Crowdin - Localize your product in a seamless way
JSONBabel - JSONBabel is a tool for translating *.json language files.