Note: All Khan Academy content is available for free at www.khanacademy.org.
Note: Firefly Lectures’ website is at www.fireflylectures.com.
Note: Professor Dave Explains’ YouTube channel is at www.youtube.com/professordaveexplains.
Note: The website of the Maths Support Centre of Maynooth University is at msc.maths.nuim.ie.
Note: PatrickJMT’s website is at www.patrickjmt.com.
Note: The website of the Maths Support Centre of NUI Galway (SUMS) is at www.nuigalway.ie/public-sites/s-u-m-s.
Note: Krista King’s website is at www.kristakingmath.com.
Note: Mario’s Math Tutoring's website is at www.mariosmathtutoring.teachable.com.
Note: The website of the Maths Support Centre of UCD is at www.ucd.ie/msc.
Note: My Secret Math Tutor‘s website is at www.mysecretmathtutor.com.