I'm looking for apps source code with user registration, login, session, oauth and SQLAlchemy for learning Flask. I have looked at the source for flask.pocoo.org website and also some repos at Github. I believe there are more out there. Appreciate any pointer. Thanks
For login / registration / etc. see Flask user authentication
For Oauth see WSGI Middleware for OAuth authentication
See flask-sqlalchemy for info on that.
Here is a decent-sized app based on Flask.
I'd also recommend searching github and bitbucket for the term 'Flask', or checking out nullege's flask page (a valuable resource for finding how other projects use certain libraries).
Additionally, the author 'eats his own dog food' which makes his github page a great resource.
Finally, kennethreitz (an incredibly productive python developer) uses flask for some of his projects, which you can find on his github page.