Wolfram’s sites offer a lot of resources about mathematics.
Founded by Stephen Wolfram in 1987, Wolfram Research is one of the world’s most respected software companies—as well as a powerhouse of scientific and technical innovation. As pioneers in computational science and the computational paradigm, we have pursued a long-term vision to develop the science, technology, and tools to make computation an ever-more-potent force in today’s and tomorrow’s world.
Their software Mathematica, not for free, allows to compute data to create interactive demonstrations; look at some examples here.
There is the possibility to examine for free a lot of their applications downloading and installing their player, unfortunately for Windows only, after that it is enough you visit the demonstrations page, browse a topic – e.g. Physical Sciences …
… and choose a subtopic, e.g. Physics and then Acoustics …
Now you can try about some demonstrations; here some examples from wolframmathematica youtube channel:
and others from the subtopic Physical Sciences/Physics/Waves:
Obviously you can try a lot of interactive demonstrations by tags, … sounds, audio, harmonics, … so:
- download and install the player
- choose an interactive demonstration
Again, at wolframalpha.com/widgets you can try or create widgets for your site/blog.