The difficulty with DDD samples is that they're often very domain specific and the technical implementation of the resulting system doesn't always show the design decisions and transitions that were made in modelling the domain, which is really at the core of DDD. DDD is much more about the process than it is the code. (as some say, the best DDD sample is the book itself!)
That said, a well commented sample app should at least reveal some of these decisions and give you some direction in terms of matching up your domain model with the technical patterns used to implement it.
You haven't specified which language you're using, but I'll give you a few in a few different languages:
DDDSample - a Java sample that reflects the examples Eric Evans talks about in his book. This is well commented and shows a number of different methods of solving various problems with separate bounded contexts (ie, the presentation layer). It's being actively worked on, so check it regularly for updates.
ref
https://tech.meituan.com/2017/12/22/ddd-in-practice.html
https://www.infoq.cn/article/alibaba-freshhema-ddd-practice
https://www.infoq.cn/article/cjq-ddd
https://book.douban.com/subject/26819666/
https://book.douban.com/subject/25844633/
https://stackoverflow.com/questions/540130/where-do-i-find-some-good-examples-for-ddd