Language Workbench is term I coined in 2005 to describe a new class of software development tool, designed to build software through a rich environment of multiple, integrated, DomainSpecificLanguages. These tools are still quite a way away from being mainstream, but development on them continues and continues to be interesting. They are one of the few things I feel could significantly change the programming landscape.

For more see the set of papers I wrote on them in 2005.