Web Address: https://beautifulaudioeditor.appspot.com/

About: "An experimental audio editor.
Copy. Snip. Pan. Record. Flexibly fade volume with envelopes. Apply and move effects (filters, compression, etc.) amongst tracks. And more.
Edit while playing for quick feedback.
Works online or offline.
Create and organize projects in Google Drive. Edit projects anywhere within Chrome or Firefox.
Store projects online or offline (in a local file to load later)."

Web Address: https://twistedwave.com/online/

About: "TwistedWave is a browser-based audio editor. You only need a web browser to access it, and you can use it to record or edit any audio file.

All the audio is stored and processed on the server, so you don't need to download anything, or save your work when you are done.

With a free account, you can edit mono files up to 5 minutes in length."