OmegaT - OmegaT is a free open-source translation memory application for professional translators written in Java.
Crowdin - Localize your product in a seamless way
Wordfast - Wordfast is the fastest Translation Memory software on the market.
Transifex - Transifex makes it easy to collect, translate and deliver digital content, web and mobile apps in multiple languages. Localization for agile teams.
Smartcat - Smartcat
POEditor - The translation and localization management platform that's easy to use *and* affordable!