Catharsis.NET.Repository is a library that provides an abstraction over persistent data storages by introducing common repository pattern interfaces over popular ORM frameworks (NHibernate, Entity Framework, LINQ2SQL).
FortNotes is an online password manager. All the records created with it are immediately encrypted in the Web browser with AES, and only then are sent to the server. The process is transparent and fully automated. It's only necessary to enter the password.