I usually find tons of resources for Photoshop (PS), like gradients (GDR) and patterns (PAT) on the many sites devoted to graphical illustration. I'm not having fun being unable to use GDR or PAT files into GIMP. So I searched for a way to either convert them automagically online or using a command-line tool on my terminal.

To my surprise, I finally could manage to get the resource to be used in GIMP:

For GDR Photoshop gradients, find cptutils-online suing your browser and upload your GDR file, tick the "convert all gradients in input (result is zipped)" box, set the selectors for input and output accordingly, and hit "Convert". Voilá!

For PAT Photoshop patterns, you need a terminal to follow some steps:

1. Make sure that libgimp2.0 and libgimp2.0-dev are installed
2. Download (find it thru Google) the text file ps-pat-load_1.c to /tmp (or somewhere else)
3. Run the command
   
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   /tmp$ gimptool-2.0 --install ps-pat-load_1.c
4. Restart GIMP
5. Open the Photoshop .pat file. You will see each pattern contained in the file as a different layer.
6. Select the layer-pattern you are interested in, save it as a new image with .pat extension on your user's directory ~/.gimp-2.8/patterns, and don't forget to include an appropriate description
7. Refresh the Patterns tab. Now you can see it in the Patterns tab.

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I'm using Ubuntu 17.04

Thanks for the tip on using "cptutils-online" to convert PS gradients into gimp gradients. It works well.

I can't get the PS pats to load. the Terminal command reports errors in file/directory, even though I followed your instructions. I usually make my own patterns anyway.

@racer-x, in order to make the GIMP plugin to work, I just adapted the instructions from this thread to my system, and then I could open .PAT Photoshop files, then the rest.

Please take a peak at the link on the image attached. I cannot post URLs directly yet.

ps pattern loader, pre-compiled Win / Linux / 32 / 64 bit

viewtopic.php?f=7&t=7120&view=next#p83933

Remember, this is a plug-in and goes inyour plug-in folder. Then loads the file as an image File -> Open

Very often a multi-layer file, export individual layers as a Gimp .pat or .png to pop in your patterns folder.

@ rich2005, that plugin you linked to works fine. I just had to make it executable so that it would work in Linux 64-bit. Thanks for the link.