Opensource or libraries for implementing marketplace or app store [closed]

Question

I'm going to implement a web-based marketplace for digital contents. Somehow its features are similar to app store where selling items are apps but my marketplace targets are digital contents. Before I begin implmenting everything from scratch, I want to make sure that I don't reinvent some wheels. Any recommended tools or personal experience is welcome. Scalability is my main concern for tool adoption.

Answer 1

I've been doing some research here and I found a few possible starting points:

• Open AppStore project: where it is not clear what has been so far, but there are no code updates since a year
• Edukap which is in fact a widget store and also hasnt been updated since a year. However the widget delivery/installation component seems to come from Wookie Apache.

More promising then the ones above, I've found:

• F-droid which is an Android App Store for Open Source Apps. Its development seems quite active and they have a running version of the store and client. However, there doesnt seem to be payment options and I am not sure if you can derive code from them without making it opensource.
• At last, there is the Ubuntu Software Center which is perhaps the most promising.

Answer 2

You can check out GigaSpaces XAP (Extreme Application Platform). XAP is a distributed framework to develop scalable, highly available, self healing and transactional systems (and much more).