OmegaT - OmegaT is a free open-source translation memory application for professional translators written in Java.
openDesktop.org - The website openDesktop.
Crowdin - Localize your product in a seamless way
SourceForge - The Complete Open-Source and Business Software Platform.
Weblate - Weblate is a free web-based translation management system.
Freecode - Freecode (formerly known as Freshmeat) is one of the legit open source development platforms that will be the key for developers and programmers to have a streamlined process via having enhanced collaboration and coding leverages.