I get that the locked-down thing is a problem. And I'm lucky to have the access I do to some things.
There is one open access journal site I know of (surely there are more). I don't know how the quality of its publications are viewed in the larger academic world. They do apparently have peer review.
It's Public Library of Science (or PLoS). Several of the CCD articles I was looking at were from them. And it looks like they have a bunch of medical publications as well. Their "business model" is to charge the people publishing on them rather than the readers. (Though I will note that some subscription-only journals also levy page charges on their authors...so I'm wondering how astronomical the PLoS page charges might be. Oh wait....just found them. Yeah, they are. Though most people will have grant moneys or institutional money to fund that).
I know there's more of a push to go open-source, especially given the argument that in some developing nations there may be funding for computer infrastructure and internet, but not for journal subscriptions. But I also do note that there is some...disdain? prejudice? out there about open source, that some people seem to see it as the academic publishing version of vanity presses, which it totally doesn't look to be, at least in peer-reviewed places.
There's also a directory of open-access journals out there, where you can browse to see what journals they link to, or do specific searches using search terms, much in the same format as other database searches. (Note that some of the journals they link are not English-language publications - so you either have to know the language or a good translator.) Most of them seem to be bioinformatics and similar "new technologies in biology" ones for biology, but I do see an Algae journal on the list...