Zooniverse - The Zooniverse is home to the internet's largest, most popular and most successful citizen...
Transifex - Transifex makes it easy to collect, translate and deliver digital content, web and mobile apps in multiple languages. Localization for agile teams.
MapSwipe - Mark streets and houses in satellite images to help create maps for humanitarian organizations.
POEditor - The translation and localization management platform that's easy to use *and* affordable!
BOINC - BOINC is an open-source software platform for computing using volunteered resources
Lokalise - Localization tool for software developers. Web-based collaborative multi-platform editor, API/CLI, numerous plugins, iOS and Android SDK.