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Google Input Tools
This utility is available either as a download for Windows (that integrates languages into the Windows language bar), or as a plugin for the Chrome browser. Permits typing in a variety of scripts, both Roman and non-Roman, and includes a visual keyboard and a predictive text toolbar, where it suggests words based on keys you have pressed. By my count, it looks like over 70 languages are supported, including Korean, Japanese, Chinese (simplified and traditional), Hindi, Punjabi, Malayalam, Arabic, Persia and others (this is not a complete list of all the non-Roman scripts).
The Chrome plugin is available in Windows and in Mac versions of Chrome, but not in the new iOS (iPad) version of Chrome.