Weblate is a web based translation tool with tight version control integration. It features a simple and clean user interface, propagation of translations across components, quality checks and automatic linking to source files.
More information about Weblate can be found on weblate.org.
Weblate is libre software created by volunteers, and accepts donations.
This Weblate instance hosts translations for various libre software projects. Weblate can host your project as well, please get in touch.
Commercial hosting is also available, pricing starts at 19 EUR per month, please get in touch for more details.