For anyone who cares:

Lone Star Footall League: http://www.texaslsfl.com/
Indoor Football League: http://www.goifl.com/
Champions Professional Football League: http://www.cpifl.org/
Professional Indoor Football League: http://www.proifl.com/
Continetial Indoor Football League: http://www.ciflfootball.com/
Ultimate Indoor Football League: http://uiflfootball.com/
American Professional Football League: http://www.apflfootball.com/
American Indoor Football: http://aifprofootball.com/

Those links were taken from Wikipedia when it comes to "Indoor American Football"