Artificial

Ball Lightning and Metastable Substance
Devoted to investigations and experimental modeling of the ball lightning and some related phenomena.
http://balllightning.narod.ru/

Gradually About All
The images on ball lightning modeling are presented. The material will be updated gradually in accordance with deriving new experimental effects.
http://www.stealthtank.narod.ru/

I. Langmuir's Ball Lightning Tube
A old (1920s ?) experiment about a ball lightning-like production with a vacuum tube.
http://www.eskimo.com/~billb/freenrg/balllg1.html

Smoke Rings and the Plasma
Beginning with an interesting comparison of the physiology of a smoke ring and ball lightning, leading to the development of a device to create ball lightning, this site continues with several well-presented accounts of the phenomenon.
http://www.goodfelloweb.com/nature/plasma/