Localizer - Free self-hosted open-source crowd-translating service
Lokalise - Localization tool for software developers. Web-based collaborative multi-platform editor, API/CLI, numerous plugins, iOS and Android SDK.
Google Translate - Google's free service instantly translates words, phrases, and web pages between English and over 100 other languages.
Crowdin - Localize your product in a seamless way
Lingvanex - Translation apps for business, travels, professional translators, students and free style people.
i18nexus - Quickly edit, automate, and manage your translations and connect them to your website, app, or video game with the power of i18next. Localization made easy.