We have been using bnwebtools for last one year for the purpose. However, this tool has gone in non-GPL direction recently. So we needed a replacement. I was, nevertheless, looking for not just a replacement but also having a next-generation solution :-).
To begin with I have converted three Bengali layouts. For Inscript layout, I chose the Baishakhi Inscript used in Baishakhi Linux which is being promoted by Govt of West Bengal (Nevertheless see the recent postings by Sayamindu, Sankarshan, Runa on some controversies surrounding it). Then I converted Ankur‘s Probhat layout which I have been using since the beginning. I also converted, another popular Bengali layout Unijoy.
To see this virtual keyboard in action visit Ankur E2B dictionary project or its virtual keyboard demo page. If you have used this virtual keyboard and have any comments/suggestions on it, then please feel free to post them here.