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

Localizer - Free self-hosted open-source crowd-translating service

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

Google Translate - Google's free service instantly translates words, phrases, and web pages between English and over 100 other languages.

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

Lingvanex - Translation apps for business, travels, professional translators, students and free style people.