Punry

Punry is a collaborative translation tool and hosting platform for (especially software) localization projects and provides API for developers.

Platform is free and unlimited for public projects to support the open-source projects and it has 60-days free trial for private projects.

Punry also provides GitHub integration to ease the localization process for software developers. If a project is created from a GitHub repository, Punry updates the strings from repository so that the developers or project managers don't need to update the template files.