Mach Zoore write:
A great overview of references for people in the field. The Reference Guide has useful information about conventional units, LEDs, moving lights, scrollers, consoles, and dimmers with links to download the manuals to your phone with a data connection. It also has handy bits about loading weights for trusses, gobo patterns, a simple beam calculator and locations of venues, with contact info and locations of stage door entrances (not as handy for anyone outside the UK, as I am, but it seems like a good list). If you're renting from White Light, they give information about their trucks, lifts, flight cases, and so on.
White Light has basically taken bits and pieces from most other lighting apps in existence, added a little more to it and sold it for less. A brilliant buy.