I used the Shootoff app recently as a display for a local gun show. I downloaded it and used it with a projector and SIRT pistols. It took me a while to figure out how to setup and run the program where I had to watch youtube videos. I tried the bouncing balls, dueling tree, falling plates, and par time modes. It was fun and attendees liked shooting at the bouncing balls.
Compared to Lasrapp:
+ Free
+ + Can use projectors, monitors, and TV's in addition to paper targets
+ Animated targets
+ Background images make it appealing
- Initial difficulty learning how to setup and use
- User interface needs a lot of work
- Missing training related options (no followthrough trace, scoring, etc)
- Audio commands and feedback suck.
- Buggy and lags a little.
I think Shootoff is great for entertainment, training on moving targets, and is a free training option. Lasrapp is a much better training program that is more refined and leads to more shooter improvement. I'll use both systems. Lasrapp for my own training and teaching classes. Shootoff to entertain people and practice some competition scenarios