Can someone recommend a version control engine + GUI that will be good for non-technical users? I'm perfectly fine with using Subversion with my team of developers, but I want to find something that will help the rest of our company. We are a design firm that deal with these type of files: Photoshop, Vectorworks, Microsoft Office, PDFs, etc. I find GUIs such as SVNx and even Versions(which is pretty nice) too difficult and techy for our designers to use. It's hard for them to understand the idea of working directories and its relationship to a repository.
We are a small company and don't have a huge budget so we would like to stay opensource if possible.