Spree VS Solidus

I think https://spreecommerce.org/ (open source, Ruby on Rails) is in that space. I haven't used it myself. - Source: Hacker News / about 1 year ago

Spree Commerce: https://spreecommerce.org/. Source: over 1 year ago

When I was working on that company, that mobile ordering app, Counterless, I looked a lot at codebases like Spree, the Spree Commerce codebase. And that's how I learned a lot about how do you model an order with line items and things like that? I saw some amazing things that helped me develop an understanding and save a ton of time by looking at oh, they have a state machine. What are the ways that an order... - Source: dev.to / over 2 years ago

Spree Commerce is headless and open-source (free) https://spreecommerce.org/. Source: over 2 years ago

So then, when the opportunity came, and I found a job that I could transition to, there was sort of a startup in my local area, Spree Commerce. So if you know the Ruby on Rails e-commerce project, they were starting a company using that on top of that project, so I went to work there. And it was a really big jump into the Ruby and Rails world and the open-source community. It was a huge transition. And most people... - Source: dev.to / over 2 years ago

In 2014, Floyd was lesser known as The Floyd Leg. Our website was on Squarespace for both its e-commerce solution and web hosting. A large part of our current success was realized by choosing to invest in a custom web application that’s built with Solidus. With our website no longer abstracted by a WYSIWYG ("What You See Is What You Get") editor, we partnered with Nebulab to handle full-stack web development.... - Source: dev.to / almost 2 years ago

I'd say Solidus and Spree are you best options rather than trying to roll out you own ecommerce solution. Source: about 2 years ago