The thing about open access is that somebody has to pay. Editorial administration

Yes we are. The ones I and my colleagues work on are all volunteer, and this is part of our academic duties.

website maintenance

There is none. We use a prepackaged suite that is free and open sourced

storage

This is very cheap and usually provided by the hosting university.

Generally either publication is free, but access is limited to subscribers

Electronic access. It is free to anyone and everyone.

copy editing

You mean a couple of grad students?

The journals I work for and submit to are free to publish and free to access.