Macaw vs Sizzy: What are the differences?
Developers describe Macaw as "The code-savvy web design tool". It provides the same flexibility as your favorite image editor but also writes semantic HTML and remarkably succinct CSS. It's time to expect more from a web design tool. On the other hand, Sizzy is detailed as "A tool for developing responsive websites crazy-fast". Sizzy is a tool for developing responsive websites crazy-fast. It allows you to preview a URL on multiple devices at once, filter the devices, zoom them in and out, and more.
Macaw and Sizzy can be categorized as "Open Source Design" tools.