Any others?

Frank Blokand's DTL Letter Modeler. And makeOTF can generate various filler symbols for Mac OS Roman.

Any first-hand experience

Drawing is a lot more fun.

> DTL Letter Modeler.

DTL Letter Modeler: ah yes, thanks.
MakeOTF: how smart is it?

Designing "metaglyph systems" is to drawing glyphs what drawing glyphs is to lettering. I think most people who prefer drawing glyphs over lettering would prefer making systems even more (if/once it's easy and powerful enough). A good litmus test might be: do you enjoy spacing a font?

hhp

Does Elementar count?
https://www.typotheque.com/fonts/elementar

Oh yeah!

hhp

Then there was this:
«TYPEFACE is software that translates facial dimensions into generative type design.»
http://www.rhymeandreasoncreative.com/portfolio/index.php?project=typeface

Some more:

Publicly available programs

• Calliculator
• FontChameleon (video) (discontinued)
• Metafont

Projects

• Lettersoup (video).
• Type Generator (pictures)
• LiveType & ParamTT (also, author has written some papers about this)

Other

There are some papers about parametric/generative font design, usually written by non-designers two or three decades ago. Also, not surprisingly there are patents, and systems which I don't know where to put, such as PANOSE.

These links are about latin parametric fonts for text. There may be some systems for experimental type that I didn't include and some interesting non-latin systems, I have to check my saved links.

Another interesting Metafont project:
http://typophile.com/node/79266

Haagse Letters

Related:
http://typophile.com/node/92278

hhp

Perhaps obvious and not really a "system" but, Python in Fontlab.

FontChameleon

WANT!