Crowdin - Localize your product in a seamless way
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.
SDL Trados Studio - SDL Trados Studio is the complete translation environment for language professionals who want to edit, review and manage translation projects.
Lingvanex - Translation apps for business, travels, professional translators, students and free style people.