A great competitor for PS is around the corner: Affinity Photo. The beta is already fantastic. Doesn't eat or waste RAM. No need for PS anymore. Oh, wait, the price is less than 50 US$ - and it is YOUR product, not connected to a cloud or credit card.
Another 48/16 bit image editor is PhotoLine. 64 bit app, Windows and OS X. Small, fast, stable, 59 Euro for the download. Runs with PS plug-ins. Doesn't waste or eat RAM.
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