Please indicate which apps can be used offline

One thing I wonder about apps ever so often is:

Can this app be used offline

This holds for map applications, routing but also calendar and contacts.

There could be several possible states (example calendaring application)

• no offline capability (e.g. calendar entries only available when online)
• r/o (existing calendar entries available but can't be edited)
• r/w (entries can seen and edited but app might need a manual sync command when network is available again)
• fully automatic (no sync needed, only manual intervention when conflicts need to be resolved