CapnoBase provides free Matlab GUI software tools (standalone) that can be used for handling, visualisation and labeling of respiratory signals (capnogram, flow and pressure).
The software is available here.
Software tutorials and help are available here.
For downloading the datasets go to the different available capbobase databases.
Note that when you are using the CapnoBase software for your work, we would appreciate if you cite the CapnoBase reference in your publication. Thank you.