BarracudaDrive is a product that focus on file hosting, similar to online services such as Dropbox, but instead of using an online service provider, you use your own Mac computer. The product can for example be installed on a Mac (turning the Mac into a server) and accessed from any type of client computer, including iPhone, Windows, Andriod, etc.

The Mac Finder is used when using a Mac as a client and when connecting to a far side BarracudaDrive server. You can Google "mac WebDAV" and you will get many hits. I found the following when searching:
https://webadmin.unt.edu/wiki/use-webdav-mac-os-x-finder

Connect to BarracudaDrive from iPhone:
http://www.appexplorer.com/a/382551345/

You can also use Apache that comes with your OS X as a file server, but The Apache/WebDAV combination is difficult to setup for non technical users. For example, you have to make sure the server is secure, that you have your users configured correctly etc, all by using hard to understand configuration files.
For example, the following article shows how to use Apache:
http://gigaom.com/apple/how-to-enable-webdav-on-your-mac-for-iwork-on-ipad/
All of the hurdles are avoided when using BarracudaDrive.