Microsoft has a similar tool to Google Transliteration tool. This tool is available for Hindi and other Indian languages Bengali, Gujarati, Kannada, Malayalam, Marathi, Oriya, Punjabi, Tamil and Telugu.
You can go to the page http://specials.msn.co.in/ilit/Hindi.aspx for these tools.
The Indic language input tool is available for both web and desktop. Web version is available as bookmarklet for top browsers as Internet Explorer, Firefox, Chrome, Safari and Opera. Desktop version needs Microsoft .NET framework 2.0 and Microsoft Windows Installer 3.1 if it is not already installed on your system.
If you have installed both web and desktop version on your computer system you can use this tool to input Hindi characters in computer and in browsers.