What are some alternatives?
When comparing Crowdin and Get Localization, you can also consider the following products
Transifex - Transifex makes it easy to collect, translate and deliver digital content, web and mobile apps in multiple languages. Localization for agile teams.
Zanata - Homepage for Zanata translation software
POEditor - The translation and localization management platform that's easy to use *and* affordable!
Pootle - Multiple file formats.
Smartling - Website localization & translation
OneSky - Full Stack Localization Solution