Hand-crafted lists of strong sites for a topic. Not live search. Searchable maps now live on gkhoj.com; notes and the agent will live on infoqk.com.
Formal sciencesMath, logic, CS. Physical sciencesPhysics, chemistry, space, earth. Life sciencesNCBI, UniProt, bioRxiv. Health & medicinePubMed, Cochrane, WHO. Social sciencesEconomics first. HumanitiesSEP and IEP.