Are there any open source bitcoin exchange projects under development?

As a keen observer of the cryptocurrency and finance landscape, I'm curious to know if there are any open source bitcoin exchange projects currently under development. With the ever-evolving nature of this industry, it's essential to stay abreast of the latest advancements and initiatives. Open source projects often provide a transparent and collaborative environment for developers to build innovative solutions. Therefore, I'm interested in exploring whether there are any such projects focused on bitcoin exchanges that are actively being worked on. This could potentially offer valuable insights into the future of bitcoin trading and exchange platforms.