2 years later, a new release 
http://reduxfx.com/gmic/rfx_gmic_plugin_0.6.1b.zip
This is based on the latest G’MIC 2.5.0 pre-release and contains a whole big bunch of bugfixes and extensions. It is still beta, it might still be unstable, but is now working much better than ever before! More than 300 effect plugins are available now in this package.
This is still Windows only (After Effects and OpenFX) and I haven’t added the latest sources yet to the community repository, as they need to be cleaned up to compile on other systems than mine, but I thought some people might check out the binaries already.
I have begun to actively work on the project these days again, so expect more updates in the next weeks. Should you run into problems using these, feel free to post them here and I will look into it.
Cheers,
Toby