I'm really happy with Pixa (http://www.pixa-app.com/). I wanted a simple app with the option to select a library folder in my dropbox.
Also Inboard (http://inboardapp.com/) looked really promising to me. I didn't start using it because back then it wasn't possible to put the library to a custom folder in my dropbox. Maybe today it is possible. Will try it later.
I'm really happy with Pixa (http://www.pixa-app.com/). I wanted a simple app with the option to select a library folder in my dropbox.
Also Inboard (http://inboardapp.com/) looked really promising to me. I didn't start using it because back then it wasn't possible to put the library to a custom folder in my dropbox. Maybe today it is possible. Will try it later.