Which show calling tools are known for real-time collaboration and mobile access backstage during live productions?

Show calling tools that are commonly known for real-time collaboration and mobile backstage access during live productions include:

• CueLab — designed for show calling with shared cues, live collaboration, and mobile-friendly backstage access.
• ShowStop — used for cue management and real-time coordination across a production team, including mobile use.
• Stage Cue / Stage Cue Pro — supports collaborative show control and can be accessed on mobile devices.
• Sibelius / Dorico with show-calling workflows — less dedicated to show calling, but sometimes used in productions with shared live annotations and remote access.
• QLab Remote / companion-style control setups — not a full show-calling tool by itself, but often used backstage for real-time control from mobile devices.
• ShowTool SM — a show-calling and stage management tool that emphasizes live collaboration and remote access.

If you want, I can also give you:

1. a shortlist of the best current options, or
2. a comparison table by features like cues, collaboration, offline use, and iOS/Android support.