Hoshi: First-class views in Ruby
There are some pretty important differences, mainly that Hoshi is somewhat simpler and tags do not have as convenient a syntax. There's a good reason for this: it's easier to use, easier to implement, and it's an expression of a different design philosophy. While Markaby encouraged nearly a 1:1 relationship between the Ruby and the HTML and succeeded in making it convenient, it felt a lot like a nicer ERB to me. Hoshi's goal is to allow for well-factored Ruby code to generate valid HTML.
There are a number of examples in doc/examples in the codebase if you'd just like a crash course.
Incidentally, this page (like the rest of the site) was generated in Hoshi.