Ruby’s success in several domains is arguably due to domain-specific languages (DSLs) that generate code: we have tools that generate HTML, CSS, and Javascript, and so we get to write web applications in ruby; ditto SQL and database applications. There are some less well known examples in the simulation and embedded real-time domains, with native code generation. Two other domains are ripe for the same treatment: animation and network programming. My talk focuses on these four cases, two existing and two hypothetical.