photoalbum is a simple node/express app to let a user browse hierarchically organized sets of photos. Currently it's in a useable state but it's display only, you have to load the photos to the server manually.
It doesn't use much on the client except a little jquery and a module called swipebox for the full screen photo swiping on mobile. It's responsive.
Here's a sample site:
If you're interested in this have at it. Contributions welcome.
Mike