All resources
Open data archives, literature access, free compute, software, publication pathways, funding, and learning materials — each with a concrete access method and an honest label for what is free and what is gated. Built for people researching without institutional access.
Include a resource only where a meaningful free route exists, and state exactly what that route is — the package to install, the endpoint that needs no key, the registration hoop, the quota. Where a resource is free only in part, say which part. Where the wall is institutional, say so plainly instead of listing it as free. Prefer a number that can be checked at the source over an adjective that cannot.
A list of links answers what exists. The harder question — the one that costs an afternoon each time it goes unanswered — is what can I reach from where I am sitting. So the caveats here are not an appendix; they are half of what the catalogue is for.
Every entry was checked against the resource's own pages, with figures taken from primary sources rather than secondary write-ups. That does not make it durable: free tiers shrink, archives migrate, grant programmes skip a year. Check the source before you build on it, and open a pull request when you find something that has moved — status changes are the one thing a catalogue cannot notice by itself.