This one is a shameless plug (I created the app) while it's still in early stages of development, the core features are working, I use https://github.com/rmpr/a

This one is a shameless plug (I created the app) while it's still in early stages of development, the core features are working, I use https://github.com/rmpr/atbswp https://github.com/rmpr/atbswp to automate demos, whenever I have to present a demo in front of people, I just record it before and replay, but the app can have many use cases beside this. You're only limited by your imagination.