Some, perhaps too obvious observation ('own' plugins using 3rd party plugins)

I made me my very own 'that-pic-needs-more-punch!!!'-effect, mainly a slider-rig, with a rude combining of a gamma-'correction', a sharpen-filter AND a 'luma sharpener' from fx/factory ... (any professional colorists forgive me!)

works nicely on my Mac - and, oh, what a surprise!, - does NOT work on any diff. Mac without fx/factory. ...

So, a handcrafted plugin does not 'wrap' 3rd party plugins into a box to carry it to non-licenced machines....

using Grey Matter v.02 for a second: ... for sure! that's logic! What else?!
But worth a try .......

Yes, I use lots of FxFactory's Quartz Composer plugins with Pixelmator, also. Again, if there's a system without FxFactory installed, you don't have those plugins to use. But it is nice to have access to these nice tools with a free FxF download.