[spamatica]

As I was already familiar with Helm it didn't strike me that it is not easy to figure out what it is from that home page.

It is a software based synthesiser mostly used as a plugin into a music creation application, usually called DAW (Digital Audio Workstation).

There are tons of these, not as many that are open source.

[monoscient]

It's also really good and the interface is really nice.

I don't use it much since Vital, by the same author, does most of what Helm does & more.

It's honestly so nice of him to make both of them available for free.

[ShadowBanThis01]

Thanks for that. A bit of it belongs in the title, regardless of what information the link goes to. For example..

Helm: open-source software-based synthesizer