Is elk open-source?

Excuse me, I was wondering if you could clarify something for me. I came across the term "elk" in the context of cryptocurrency or finance, and I'm a bit confused. Is elk an open-source project? If so, could you elaborate on what makes it open-source and how that impacts its development and adoption within the cryptocurrency or finance space? Additionally, are there any notable features or benefits that stem from elk being open-source? Thank you for your time and consideration.