Smalltalk was marginalized by its image-based nature. It's an operating system as much as it is a language, so packaging up a native application to run 'outside

Smalltalk was marginalized by its image-based nature. It's an operating system as much as it is a language, so packaging up a native application to run 'outside' the image requires various widget libraries and runtime structures that haven't yet matured in the free Smalltalks. You'd have to look for enterprisey applications written with Cincom's VisualWorks, or Inception's VA Smalltalk. The web is where it currently excels. Hence the prominence of Seaside, and similar frameworks.