In fact, openbazaar has been maintained. But version 2.0 is too hard to use, we raised some funds and we will release version 3.0 in November. Its performance is much better than 2.0.
https://www.reddit.com/r/OpenBazaar/comments/x4qy1y/the_demo_of_version_30/
https://www.reddit.com/r/OpenBazaar/comments/x4qy1y/the_demo_of_version_30/