- Quanta Magazine – Popular-level source on current developments in science, math and computer science.
- Mathematics with societal impact:
Metric Geometry and Gerrymandering groups at Tufts
- LA Math Circle, a weekend math program at UCLA for K–12 students (see here for math circles around the US).
- Set game online. There has recently been a surge of research activity on the related concept of a cap set.
- Igor Pak on how to write a clear math paper (some good advice I've probably failed to follow).
Also useful for writing math papers: Detexify.
- Mathematics blogs:
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