These sample applications are not anything you haven't seen before. The cool thing is that these are easy to customize and integrate into your web site.
The classic simple apps:
Evolutility can be setup for single- or multiple-user environments for collaboration (sharing records and comments) or with row-level security.
Sample code for developers demonstrating features like dependent fields, permissions, events, navigation, localization...
EvoDico is a database to store applications metadata, and an application to modify this metadata. It is a Web application which can modify itself.
In addition, because these are built on top of a standard and robust technologie stack (Microsoft .NET Framework and SQL Server), they can be hosted anywhere and scale to thousands of records and hundreds of users.