https://www.dictionar-englez-roman.net/dictionar_englez_termeni_matematici.html → Romanian - English math dictionary
https://gswarrin.w3.uvm.edu/vocab/index.html → vocal pronunciations

gnuplot → plot

https://www.sagemath.org/ → open source computer assisted mathematics (alternative to matlab)

Number Empire - powerful math tools for everyone
Desmos scientific calculator

Calculus Made Easy → learn calculus by example and practice

https://overreacted.io/the-math-is-haunted/ → post on Lean, a theorem prover programming language

https://detexify.kirelabs.org/classify.html → find LaTeX symbols by drawing them

• https://www.andreaminini.net/ → online knowledge base on lots of topics
• https://graphicallinearalgebra.net/ → make linear algebra fun with diagrams

Awesome Math resources
The On-Line Encyclopedia of Integer Sequences (OEIS)