Crowdin - Localize your product in a seamless way

Lokalise - Localization tool for software developers. Web-based collaborative multi-platform editor, API/CLI, numerous plugins, iOS and Android SDK.

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

MetaTexis - MetaTexis offers computer-assisted translation solutionsfor translation agencies, companies, and freelance translators.

PROMT - PROMT is an automated translation engine.

qTranslate - qTranslate makes the creation of multilingual content as easy as working with a single language.