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For those in this thread that are apprehensive about using GIMP, I'd recommend checking out a patch called PhotoGIMP that makes GIMP much more usable : https://github.com/Diolinux/PhotoGIMP
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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There's a similar open source alternative called Darktable
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Depending on your workflow it might make sense to export PNGs directly from Affinity and then reduce their size with a utility like Oxipng, which uses all your cores to find the best algorithm for each particular image.
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Open www.Photopea.com and disconnect from the internet. You will see, that all features work properly. Photopea needs the internet only to load the latest version of the software (= 1.5 MB of Javascript) into your computer (and run it on your computer).