From Aleksander Simonic:
WinEdt is a powerful and versatile text editor for Windows with a strong predisposition towards the creation of TeX documents. WinEdt is used as a front-end for compilers and typesetting systems, such as TeX, HTML or NSIS. Although WinEdt is reasonably suitable as an all-purpose text editor it has been specifically designed and configured to integrate seamlessly with a TeX System (such as MiKTeX or TeX Live). WinEdt documentation does not cover TeX related topics in depth. You'll find introductions and manuals on typesetting with TeX, as well as links to other recommended accessories, on TeX's Community Site.