I've been a fan of Fw for many years and now primarily use Sketch. It doesn't have the raster capabilities of Fireworks (Pixelmator's there when I need to work w/ bitmaps), but it has the same concept of Stylized Shapes and Shape Groups instead of Layers.

Lately I've also enjoyed its "Copy CSS Attributes" feature for building linear gradients or shadows visually, then getting code which I can quickly use in browser.