Pedals.io, the guitar effects app in the browser with online jamming (opens in new tab)

Your own pedalboard and effects system, without any hardware, on the web, with jacascript, which means you do not have to install or run anything extra like java, and it is open-source. Easy to install, too! create your art, on the cloud.

It's built on top of pedalboard.js, an open-source library at https://github.com/dashersw/pedalboard.js

It only works in Chrome right now, as Chrome is the only implementer of the full Web Audio API.

it would be very useful for guitar beginners, playing with cool effects before buying any hardware