Maybe i mispelled rendeergraphics could even be rendeersgraphics or something similar try also with "Fovea " or "Fovea Pro"
Has 1 free and very good plugin for Adaptive Contrast one quite geekly Convolution Matrix filter (that for free... much more for trial)

Has anyone tried the plugins on http://www.mehdiplugins.com/? Do they work in GIMP 2.10.20?

Haven't tried many, but do use Mehdi's Local Equalization plugin in GIMP via PSPI and it work great, Mackenzieh.

Do you still need something to call them through?

Use PSPI directly, Sallyanne (i.e., not using Shellout) for Local Equalization. Also, if you have a good surrogate program, Shellout's always an option none the less.

Thank you

Yes they do, I used some of them in 2.8 and just tested Noise Shampoo with 2.10.
But the preview windows are annoying, you have to zoom into 100% and drag the image.

All filters work fine.

Have you tested them to see if they actually work? I ask because the site hasn't been updated since 2017 and there are only 4 64 bit plugins that are compatible with GIMP. https://www.mehdiplugins.com/english/64bits.htm

I thought you can only use 32-bit 8bf (photoshop filters) with PSPI because the PSPI plug-in is 32-bit.

I downloaded today (my versions were older).
Mehdi Plugins
http://www.mehdiplugins.com/
Skipping 64bit (some are in both versions) - only 32bit work.

This page has 5 compatible 64 bit filters: https://www.mehdiplugins.com/english/64bits.htm

Yes those 64-bit 8bf filters, work in a 64-bit host. PSPI is still 32-bit AFAIK.

viewtopic.php?f=4&t=14444#p198758

Introduction
============

This is pspi, a GIMP plug-in that interfaces to Photoshop filter plug-ins.

First, the bad news: Pspi only works on systems that understand i386
Windows executables, more specifically, DLLs. (Photoshop plug-ins are
actually DLLs.) Pspi was developed on (i386) Windows......

https://github.com/draekko/gimp-pspi

The 32bit filters work.. not the 64 bit. If you have a 64 bit system the 64bit filters throw out errors in gimp.

Ah; you were referring to 64-bit plugins. As already mentioned, PSPI only works with 32-bit 8bfs. Not even sure 64-bit PS plugins will work with XNView.

I'd just use ShellOut.

The Sapphire plugins on this page: https://saturnelladesign.fr/pages/filtres.htm didn't work for me. I wanted to try those out. When I downloaded, unzipped, installed them on gimp, I got errors when trying to use them.

I said so 2 times already. You can't use 64-bit 8bf filters on a 64-bit system on a 64-bit Gimp because PSPI plug-in is the 8bf host, and it is 32-bit.
There's no difference how the filter works, unless the 64-bit Mehdi filters have been updated with new features.

Most of the 8bf filters are very old and useless. Redfield filters are pretty good, but all of them are not free.

I have the freeware Redfield filters.