The free version of WebCatalog lets you install up to 2 apps with all available features.
You can purchase the license for $9.99 to install as many as you need.
WebCatalog has permanent licenses, which have no time limit. In other words, the license never expires and works with all versions (including major updates). Also, your license permits you to use the app on all of the devices (despite operating systems) you own, as long as you are the only one using the app.