App Passant is a way to share chess games (historic or current) over app.net. It is evolving, and will support challenging your friends and easily playing the games through the interface.
I welcome collaboration. Filing an issue or offering a pull request is a good way to get started.
An annotation format is being discussed here.
The production instance is at http://www.apppassant.com/ , and dev is at http://dev.apppassant.com/ .
You can contact me through app.net or email.
The project as a whole is under the Apache License 2.0. It uses third party libraries given in index.html.