Virtaal is a graphical translation tool. It is meant to be easy to use and powerful at the same time. Although the initial focus is on software translation (localisation or l10n), it can be useful for document translation.
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String Alternatives
String is described as 'Manages your language files - from PHP to PO to Rails to iPhone apps. Import and export easily' and is an website. There are 1 alternatives to String, not only websites but also apps for Mac, Windows and Linux. The best String alternative is Virtaal, which is both free and Open Source.