Updated: 2013/03/01
Google Input Tools for windows is superb.
Old methods:
http://www.ucsc.cmb.ac.lk/ltrl/services ... er/t1.html
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Another easy online sinhala unicode keyboard from UCSC. http://www.ucsc.cmb.ac.lk/ltrl/services/keyboard/
Some of our members have submitted following valuable Sinhala to English tools.
Nuwa
http://singreesi.vndv.com/download.htm
Rksk
http://www.madurax86.com/rsinglish/
Chathura
http://www.google.com/transliterate/Sinhalese