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For questions seeking recommendations for online mathematics resources that are useful at a research level.

10 votes

Most helpful math resources on the web

Sci-Hub is pretty helpful in accessing articles, even for those researchers who already have access to several journals. The interface is great, the site is pretty fast, and the database is huge. See …
5 votes

Combinatorial databases

Andries Brouwer's collection of strongly regular graphs: http://www.win.tue.nl/~aeb/graphs/srg/srgtab.html Eric Moorhouse's collections of finite projective planes and generalized polygons: http://eri …