OmegaT - OmegaT is a free open-source translation memory application for professional translators written in Java.
POEditor - The translation and localization management platform that's easy to use *and* affordable!
ForeignDesk - opensource product for computer assisted translation (CAT, TAO in French for Traduction Assistée par Ordinateur). Allows you to better translate resources.
Transifex - Transifex makes it easy to collect, translate and deliver digital content, web and mobile apps in multiple languages. Localization for agile teams.
CafeTran - CafeTran Espresso: The feature-rich CAT tool that is fun to use.
Crowdin - Localize your product in a seamless way