You may want to look into Owncloud. It's opensource. You can run it from your own server or host it elsewhere. They do have clients for MAC and IOS. I'm not a MAC user personally, but I do believe they support MAC resource forks. You can also access your information through any web browser as well. I've been running it off my personal server for a while now. I am completely satisfied with the software.
I could honestly care less about Dr. Rice being on the board of directors or not. Is she going to start a program to torture users of Dropbox? If that comes to pass, it may be a cause for concern. Other than that it appears that Dropbox is adding an accomplished and intelligent person to their board. Is who ever made this website, going to run around and try to get Dr. Rice fired from every job she gets? It really does appear that this is a personal vendetta of some sort.
However! I do welcome the thought of people looking for alternatives to Dropbox. I consider trusting your information with a propriety company based in the US, to be quite foolish these days. Personally I use Owncloud. It's open source. You can run it from your personal server. Owncloud has clients for Linux, Window, MAC, Android and IOS. You can also access your information through any web browser. To put the cherry on top, Owncloud has the capabilities to sync contacts, calendars and bookmarks across your all devices. It's a great piece of software and should suit those looking for an alternative.
http://owncloud.org/