I wouldn't necessarily see the lack of languages currently available as lack of interest. I think it is going to take a little bit of time after the DLR becomes stable to see the growth of the set of languages. To have a completely DLR-based language takes
quite a bit of effort in quite a few technologies. I believe that the DLR is going to revolutionize the teaching of Computer Science.
We have the beginnings of a version of Scheme that we are migrating to be fully DLR-1.0 compliant:
This isn't our main focus, so the Scheme development is a bit of a back-burning item. We are also working on a new drag and drop visual language, called Dinah, which is also based on the DLR-1.0:
If there are other DLR languages, we'd like to include them in our educational bundle, called Pyjama. If anyone is interested in working on DLR languages for education, please drop me a line.