A fabulous DfE funded site aimed at enhancing professional development in Maths teachers across all sectors and levels. There are news items, message boards, regular email magazines, stacks of resources and links to some very interesting blogs from maths teachers, etc.
This site, created after the 2010 election, replaced old uk.gov education sites such as the Standards Site and various post-16 sites. It is now archived.
Most of the Publications sections has disappeared although you can still find some important documents such as the Leitch Review (2007).
I produce handouts for my own teaching and I upload a few examples each week. This link leads to a page which automatically lists the handouts. Each handout entry includes topic tags (I haven’t cracked level tags as yet but I am working towards that). The handouts are produced mostly in OpenOffice and exported as pdf files.
The CIMT Mathematics Enhancement Programme now has its own web site (previously based at Plymouth University and, before that, Exeter University) has been one of my favourite and most used sites over the past 15 years.
In addition to L1-2 past papers, AQA has a good selection of Functional Maths (FM) tasks for underpinning and practice. There used to be a very good 110 page PDF document with 30 challenging maths tasks written by Leeds University to support teachers in pilot Functional Skills centres way back in 2008! The document has disappeared from the AQA site but I've found