More maths for students of AS/A level Mathematics

Here are some places where you can find free collections of interesting mathematical articles, challenges and puzzles to explore:

NRICH provides a collection of activities and games and includes some ideas to help you prepare for university.
Brilliant is a US website that provides a brilliant selection of challenging mathematical problems.
Numberphile is a collection of fascinating videos about numbers.
Plus Magazine is an internet magazine a wealth of articles about the beauty and application of maths, puzzles, podcasts, videos and book reviews.
MathsChallenge.net offers a collection of maths puzzles with a range of difficulty levels to choose from.
Chalkdust magazine is a maths magazine a collection of articles, features and pictures that are interesting, fun, or thought-provoking.
Cut the Knot is an encyclopaedic collection of maths games, problems, puzzles, and articles.
Nick's Mathematical Puzzles offers over 100 excellent puzzles, many of them using A level Mathematics.
Mathigon is a collection of free recreational maths articles, activities and puzzles that aim to make maths more accessible and entertaining.
Wikipedia Mathematics Portal includes thousands of articles about maths.
Mr Barton Maths includes a selection of maths and logic puzzles, and maths jokes too!
MacTutor History of Maths Archive is an extensive and searchable archive of the history of maths.
MathWorld has some excellent recreational maths activities.
Wolfram|Alpha is a fascinating mathematical search engine.
The legacy Further Mathematics Support Programme (FMSP) produced a series of 20 Podcasts that take a topic from the A level Mathematics or Further Mathematics and explore at its applications.