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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I like to call such a list a "wall of shame", and I have my own over here: http://jeffrey.io/wall-of-shame.html
What has helped me over the years is that I view tech as art, and so these projects are only market failures. Your growth as a technologist is manifest, and it's important to see side projects as a form of practice.
If you can move past the failure label and see everything as successful at something, then you feel a whole lot better. A discipline that I have had for decades now is to write a postmortem on why I believe a project is a failure because that crystalizes my learning.
My history helped me excel as a principal engineer which put me towards an early retirement where I can now focus on my ultimate side project: Adama ( http://www.adama-lang.org/ ) which I am turning into a new kind of PaaS thing.
Here is the crazy thing: I already know that I'm making several mistakes as I have no customers and no one asking me for anything. This is an exceptionally lonely way to start a project as the OP and others have noted, but I'm enjoying it well enough.