These are either free or modestly-priced website builders that allow users to create simple sites.
Pros: Full hosting and domain services are available at relatively low cost. Design is flexible. Widgets and other added functionality is available for websites. Use responsive design, which adjusts layout of pages to fit the screen size (desktop, tablet, mobile phone, etc.).
Cons: They are limited in structure. There are some bad templates out there that can result in horrible design. You are often signing away considerable rights by signing up.
These are tools primarily for giving presentations in public or on the web, but can be adapted to display a collection of items or to tell a story.
Digital Scholarship offers support and hosting for digital exhibits on these platforms.