OneSky provides a powerful cloud-based translation management system (TMS) that streamlines the entire translation management process for mobile apps.

POEditor is an online localization management tool, perfect for collaborative or crowdsourced translation projects.

Translation.io is a translation service, especially for Ruby.

Transifex is a proprietary, web-based translation platform.

Crowdin is a localization project management platform and translation tool for developers and website owners.