Some tools for auditory scientists:
Headphone check test code | try it | paper
an online headphone check test using dichotic pitch stimuli to ensure that your participants use heaphones rather than speakers.
Sound volume setting procedure code | try it | paper
A sound level meter helps you and your participants to reliably control stimulus amplitude in online testing.
Adaptive Staircase Thresholding Procedure code | try it | paper
A plugin to do staircase online