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Pixelc
An opensource tile/sprite editor in C, using SDL2 and OpenGL, also running on Android and in the web
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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 am doing a little game dev as a hobby with pixel art games and also created a pixel art editor called "Pixelc" with the some framework: https://github.com/renehorstmann/pixelc
Your style guide is also definitely worth highlighting. Most of my efforts to learn this language have come from reading example code and guessing at the reasoning of the author's design decisions, so these explanations are a godsend.
NOTE:
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Hence, a higher number means a more popular project.