Eclectic Technology

Most maths students would already know about WolframAlpha as our lecturer regularly accesses it.  This scoop goes to a video which explains the wider (eg Sciences) uses for it.  For those doing maths or sciences, this resource is unbelievably useful.  I'm not sure I would be understanding my maths subjects without it.  I use it for double checking my answers (then you can go back through your working knowing there is a problem in there somewhere), for checking rules that I've sort-of forgotten, graphing problems to give me a rough idea of where I'm supposed to be heading with a problem. 
Generally I find it is very reassuring to have it there - I don't freak out when I get stuck, because I know I can usually get some tips in my working out by dissecting a problem into manageable chunks and running those chunks (e.g. differentiation) through the engine.  I can see how maths students at school would benefit from this backup/safety net/ like have a tutor check your work.
I think every maths student should know about it.  (just like the Khan Academy!)