Weblate - Weblate is a free web-based translation management system.
POEditor - The translation and localization management platform that's easy to use *and* affordable!
Crowdin - Localize your product in a seamless way
BabelEdit - Edit your json, yaml, php, vue or properties translation files with ease.
OneSky - Full Stack Localization Solution
JSONBabel - JSONBabel is a tool for translating *.json language files.