Crowdin - Localize your product in a seamless way
POEditor - The translation and localization management platform that's easy to use *and* affordable!
Poedit - Poedit translations editor. The best way to translate apps and sites.
Weblate - Weblate is a free web-based translation management system.
Translation.io - Translation.io allows you to localize Ruby on Rails applications using either `t('.
JSONBabel - JSONBabel is a tool for translating *.json language files.