Adobe Fireworks.

Technically, it still exists. But, it's been abandoned for years, so it no longer "exists" than any more than the bytes of any other defunct program.

Sketch is far superior to Fireworks, so it no longer matters, but the abandonment of Fireworks actually caused me to completely stop designing websites, for years. It was too painful to use anything else, so I just gave up on it and started using Bootstrap to "design" sites.