My open-source library, Allotment, has been slowly gaining traction. It's around 20 thousand downloads per week. While it isn't a huge number, it isn't nothing. There is also enough interest that a healthy number of issues and feature requests get submitted.
One statistic GitHub makes available is which other repositories use you as a dependency. The UI isn't great as you can't sort by stars so I used ghtopdep to give me the top ten repositories by number of stars.
JSON Crack is out in front with nearly 25 thousand starts. It lets you visualize your JSON data instantly into graphs and looks really smart.
Notesnook is a free (as in speech) & open-source note-taking app focused on user privacy & ease of use.
Hetty is an HTTP toolkit for security research. Now, just because Allotment is listed as a dependency it doesn't mean it is actually used. This is the case here. Perhaps a developer was just ttrying out Allotment and forgot to remove it as a dependency when they were done.
All-in-all it's rewarding to see my work used in some popular projects.