Equivalents of PubMed in other fields I work in biomedical sciences, and whenever I need to look up an article - or find recent references about a certain field of biology - I just go to PubMed, because it collects information from the vast majority of "serious" journals (from Cell/Nature/Science to niche publications). 

Are there equivalents of PubMed (comprehensive and easy to use) in other fields, except for Google Scholar and ArXiv? For example, in physics, chemistry, geology, electronics...?
Unlike PubMed, many of the discipline specific indexing and abstract services tend to be run as proprietary services:


For Engineering there is Engineering Village 
For Chemistry there is the Chemical Abstracts Service (CAS) SciFinder
For Theology and Religious Studies there is Index Theologicus
For Philosophy there is The Philosopher's Index and PhilPapers
For Geology there is GEOBASE and GeoRef
For Economics there is EconLit and RePEc
For Mathematics there is Mathematical Reviews and zbMATH (hattip Dave Renfro)
For Electronics and Computer Science there is IEEE Xplore
For Agriculture there is AGRICOLA and AGRIS


Wikipedia has quite a full list that might be of further interest:
https://en.wikipedia.org/wiki/List_of_academic_databases_and_search_engines