Samuel Kwok Online.   Official site for Master Samuel Kwok.  Ip Chun / IP Ching Lineage.  This replaces the original site and no longer contains the useful articles, information on Wing Chun.  However, despite its more commercial focus it is a great place to purchase GM Kwoks great range of books and videos.

https://samuelkwokonline.com/

Singapore Wing Chun.   Grandmasters Yuen Kay San lineage.  A great site with some useful articles, information on Wing Chun and their lineage.  Also have a good selection on their products page.

http://www.singaporewingchun.com/the-power-of-speed.html

Snake versus Crane. A great Wing chun site by Steven Moody with loads of great articles, sharing great insights and experience.

http://www.snakevscrane.com/