App Manager can work as a Apps Store for web apps and mobile apps while providing whole set of other features.
- Single sign on/ Single sign out between web apps
- Role/permission based access control for web apps
- Capability to configure federated authentication for web apps
- Subscription maintenance in App Store
- Commenting, Rating capabilities in App Store
- Statistic monitoring for apps usage
Above are the core features comes with App Manager. Have a look at App Manager product page to get an idea about whole other features and its capabilities.
http://wso2.com/products/app-manager/