Student email about to expire - what free stuff can I get?

So I recently renewed my JetBrains student status (although I haven't actually used any of their (apparently great) tools yet, hah) and it got me thinking:

what other free/discounted tools/courses can I take advantage of while I still have a student (.ac.uk) email address? Would be cool to have a list for students to refer to.

Cheers!

edit thank you, everyone, for all the replies! Really helpful