It has got Compressed Memory feature which will automatically shrink inactive data in the memory in order to keep the Mac as quick and responsive as possible. If you are looking for installing additional application, the Mac App Store application allows you to browse through a large collection of the utilities which are verified by Apple. You can write notes, send/receive emails, perform mathematical operations and browse online etc.
With this application you can organize your contacts and calendars. It features loads of default applications designed to help you manage your everyday activity very efficiently.