POEditor - The translation and localization management platform that's easy to use *and* affordable!

Transifex - Transifex makes it easy to collect, translate and deliver digital content, web and mobile apps in multiple languages. Localization for agile teams.

Weblate - Weblate is a free web-based translation management system.

Crowdin - Localize your product in a seamless way

OneSky - Full Stack Localization Solution

BabelEdit - Edit your json, yaml, php, vue or properties translation files with ease.