Pootle is a Web-based translation and translation management tool. It provides a rich set of features for mangaging a translation project. It integrates components of the Translate Toolkit to provide error checkers for translation messages and the ability to download files in a number of formats: PO, XLIFF, CSV. Pootle can also provide compiled PO files for download. You can use it to assign work to translators in your team, and you can define goals to help focus the efforts of your translation. Pootle can run without a Web server or be proxied through your existing Apache server.
Virtaal is a tool for computer-aided translation that offers a simple, user friendly interface. It includes powerful features such as translation memory, terminology management, and placeable handling. Virtaal can edit files such as Gettext PO, XLIFF, and various other localization formats.
oTranCe offers a ready to go and entirely Web-based translation platform to your project and your translators. The files you already translated can be imported easily, and the present stage can be exported to language packages at any time. If you are using a versioning system you can, update your repository with just a mouse click. All your translators need is a login to start working on translations. The administrator will be able to adjust very fine-grained rights and roles for your developers and translators.