The best alternatives to Stacks are Shoutem, Flotato, and Vue Storefront. If these 3 options don't work for you, we've listed a few more alternatives below.
WPCOM is a community/directory platform that gathered more than 350 WordPress related resources to save time when you're building your WordPress website. Discover WordPress resources as well as the ratings, comments and experiences from the actual users.
DevsPush is a software development startup based in Europe specializing in creating templates for developers & designers. We offer Ionic, Flutter & Android app templates. With our templates we provide design files for Sketch, Adobe Xd, Photoshop and Figma.