SFX is the "QLab of Windows" for musical theater and large-scale corporate events. It supports redundant playback, timecode, and complex scripting. There is a free 30-day trial, not a perpetual free version.
: Formerly the industry standard before QLab became popular. A version of this software is now available for free.
. It is a Mac-exclusive application because it relies on specific frameworks built into macOS. Be cautious of any sites offering a "QLab for Windows" download, as these are often unreliable or malicious.