Actually, there aren't! MainStage has no timeline, VSTLive is woefully over-designed and unreliable as others have said (every single section of a song re-loads the guitar patches for example - even if it's the same patch - whereas S1 keeps the guitar patch as is until you tell it otherwise, far more sensible), and has a cluttered Mixer set up with different views per song. GigPerformer is a spaghetti Western of connections and again not centred around a timeline. Maybe great for a virtual keyboard rig but not much else.
I'm using Nuendo and the Arrangements at the moment. What I want is a timeline - for clicks, lighting cues, vocal and guitar FX per section or per song and possibly backing tracks for a future project. Studio One is so close to doing this but I won't commit to creating a complete show in it whilst the support and development for the Show page is unknown.
I'm a live performer as well as recording person, and from my observations live shows have really upped the tech requirements in the last few years. Even cover bands are using their own DMX controlled lighting, and processing for effects tied to their backing tracks. The number of Laptops I'm seeing onstage is definitely on the increase- I even saw a Metal band at a local festival using autotune on a Macbook for the main vocalist -my son, a big metal fan, was close to calling them out on Insta for such a transgression! So I think tech on stage is here to stay and the Show Page could be a winner with just a few improvements.
Other multi-media apps are overkill for bands (Millumin, etc) and things like Q-Lab are great for theatres but again not ideal for timeline based musical shows. Believe me, I've looked and tried them all. I did manage to get the Showbuddy DMX running with S1 by sending MIDI program change messages internally on the Mac, but it's just one more layer of apps to run simultaneously and worry about.
We'll see!