A very useful (archived) site for both students and tutors involved in Key Skills at Levels 2 or 3. Covers Number, Communication, ICT and Wider Key Skills – many of the topics covered are equally suitable for Functional Skills support (e.g. report writing, DIY number project).
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.
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.