The translation and localization management system we initially developed to crowdsource the translation of our apps Complete Ear Trainer, Complete Rhythm Trainer and Complete Music Reading Trainer has just been released publicly as a fully-featured software under the name Cocoon.
You can see more details by going to https://cocoon-translation.com. If you have a game, app, software, website, or any project that would benefit from a crowdsourced translation (or if you want to ease the work of your translators), there is a demo and a free 30 days trial so please have a look!