How do you spot a mature platform? You look for its app store. Evernote, the platform for storing and accessing all kinds of things to remember, has created a gallery of products built with its API, which is expected to grow into a complete app store.
Nathan Kontny is out to revise how you write, especially when you work with others. His online word processing program, Draft boasts features you can't find in any other wordprocessor--like a professional editing service, for example.