TUG (TeX User Group)
Representing the interests of TeX users worldwide.
UKTUG (UK TeX User Group)
The focus for TeX-related activities in the UK.
UK TUG FAQ
Frequently asked questions about UKTUG and TeX.
UK TeX archive
A link to the Comprehensive TeX Archive Network, hosted by the UKTUG.
Donald E Knuth
The creator of TeX.
TeX Google Group
A useful link for TeX discussions.
WinEdt
An ASCII editor for TeX documents.
MathJax
An open-source JavaScript display engine for mathematics that works in all modern web browsers.