It is an interesting model, and developers seem to like it. TimeTagger is the successor to a similar product that is not open source, which I've posted about here, but never quite got a response like this :)

I love open source and maintain several open source projects. By making TimeTagger open source, I was hoping to find a niche of "tech" users. And if it fails, at least the code can be useful to someone else.

That was perhaps the most compelling landing page I've ever seen. When you mentioned the lack of cookie banner I found it strangely exciting.

I hope I'm in a salaried, non time tracking role for the foreseeable future, but if not I'll look into TimeTagger.

Hard to tell, but from my(developer) point of view I see it as a big benefit to be able to see the code. Plus it gives me the option, in case I like the service and it is discontinued for any reason, to just host it by myself. Also it adds another layer of trust and I have the feeling I can influence the product.

>Do you see model like Ghost could be a strategy to grow Open Source SaaS products?

Definitely, I think Ghost is a very good and successful example of Open Source SaaS.