Hitfilm Pro supports OpenFX plug-ins. Express does not support plug-ins. The FxHome plug-ins (Ignite Pro, Ignite Express) are not 'compatible' with Hitfilm.
Hitfilm already has all the effects built-in so Hitfilm Pro ignores them even if installed. Plug-ins tend to validate the host application. Much of this is due to support. The plug-in developer has installations of the host application for compatibility testing.
As such not all OpenFX plug-ins list Hitfilm as supported. Some that do are from Red Giant, Boris Fx, RE:Vision, NewBlue. Not all plug-ins from any given vendor list Hitfilm as supported.
[Originally posted on 04/09/18] macOS® versions of the Radeon™ ProRender plug-ins for Blender™ and Maya® are now available for artists using Apple® Mac® systems, and support Apple’s Metal® 2 API and external GPUs 1 for maximum rendering performance. How to download and install (or compile) that render plugin into Maya 2017 on mac? (MacPro with Radeon D700). Radeon ProRender for Maya for mac #6. Closed grigorovich opened this Issue Oct 28. We have support for Maya and Blender on mac via pro.radeon.com. Bsavery closed this May 14.