Looking for RoR photo publishing application for my website


I have a website that runs mephisto and I want to add a photo
publishing platform that runs on RoR. I tried out gullery and
rgallery. I'm not sure if any of them is still under active
I want an app that:

[1] is (and probably will be) under development
[2] is easy to use and supports basic features of photo publishing
(albums, categories)
[3] easy configurable CSS page in order to make it look like my
[4] community supported (if possible)

From google I was not able to find an application more popular than
rgallery (apparently is the most popular web photo publishing platform
on RoR) but as I don't know if it's still developed or abbandoned. Do
you have something to propose?