Just something to share that I’ve been having some fun with, gui-less mda vst instruments and effects.
You can find the Windows 64 bit versions from here: https://sourceforge.net/projects/mda-vst/
You can find the older Win32 and Mac/AU files as well as a downloadable help file on the main site: http://mda.smartelectronix.com/
There are quite a few effects and a few instruments, including a really sweet piano in the downloads. These have been around for awhile but they still sound pretty good to me. 
A few things I like about using these in Renoise.
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Renoise creates a native-look gui on the fly in the effects section for effects, and a simple native-look “floating” gui for the instruments.
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The effects can be used just like native Renoise effects in sample macros or combined as doofers.
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The effect or instrument parameters can be easily automated like native Renoise effects or instruments.
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It offers alternatives to a few of the native Renoise effects and adds some Renoise doesn’t have.
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Really low CPU loading, very stable and simple.
So, if you’re looking for something a bit different to try, give 'em a go and see what you think.
Cheers.