The Observer XT
The Observer XT is the ideal tool for many researchers because it saves you time scoring behaviors and it allows you to synchronize and analyze multiple signals (video, audio, physiology, etc) altogether. Provided code behavior in a quantitative way and visualize them on a timeline, which easily integrates video and physiological data. Indeed, the software is suitable for calculating statistics and assess reliability.
The Observer XT supports the entire workflow of your project, from setting up to gathering and analyzing the observational data. You can extend your system with different modules, so the system grows with you as your research progresses. Design the setup you need!