Here’s a list of links that I’ve been known to use, and that I feel will be helpful to you! I’ll update this list occasionally when I discover new things. Suggestions welcome – just drop me a line!
FOR NON-FICTION AND ACADEMIC WORK:
Google’s ‘Ngram Viewer’, for checking a term’s historical rate of appearance in print
‘Little Details’, a community full of resources for small details that make your fiction believable
‘Weather Underground‘, for checking the weather way back when
‘Behind the Name’, a great name etymology compilation
Green’s Dictionary of Slang
Note: I am in no way sponsored by or affiliated with the above links, nor have I been paid for including them. They are provided merely as recommendations and I am not responsible for their content.