Very long time since my last visit here, although still using Siduction as my daily platform.
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As the topic says, are there any easy to use AI generated photo editing applications available? And if there is, whats best?
You could look into RapidRaw, which has a .deb available. GIMP also has some AI-Plugins like Resynthesizer or GIMP-ML. Then there are web-based editors like Canva, Fotor or Pixlr.
You may have a look here:
https://www.interstice.cloud
It'S FOSS and you can install a server on your own hardware or you can use a online service by connecting the plugin to it.