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Ultimate-HOI4-GFX
Over 400 focus icon pieces, over 40 focus and idea backgrounds, and more that help GFX modders in HOI4.
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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.
Most tutorials will generally be applicable to paint.net as long as you have some knowledge of the software. There are also some sets of resources that can be used as a base such as this.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.