The demo site seems to have vanished for this plugin so I’ve downloaded a copy from the wayback machine and it can be found here:
Git hub Source:
Taken over by @joshuafontany but the demo page is down.
Original source from Evan:
I think that link was dead aswell, though i could be just not be finding the right links in the forums.
I’ll have a double check tommorow then update.
Hmm, it says:
Formula for TiddlyWiki, version 0.2.5, by Evan Balster. Updated by Joshua Fontany
Isn’t most everything in there now possible with TW itself? I have an entire calorie/nutrient tracking app made with this, because the math tools didn’t exist at the time.
For me i like that the maths looks like maths with the formula plugin! I know what the rules are (mostly) and what it should look like.
Making carbocommander (https://carbocommander.tiddlyhost.com/) with the formula plugin was difficult because capturing results required wikifying. So, for at least that usage, it would have been better if there had been filters to get the results directly. Or at least that’s how I’m remembering – it’s been 7 years now!
Using wikitext for math is sort of like using RPN on steroids.
I loved the formula plugin and whish we mainstreamed it. I love the mushroom braces (= formula =) and the sheer extencibility of it. No there are still meany features of the formula plugin not in tiddlywiki yet, and where the do they are much more cumbersom.
To modernise this it would work not unlike \functions thus not requiring wikification, and you could also use it in backtick parameters see Substituted Attribute Values
- perhaps an operator in which the formula could be provided, like we can with regex.
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Anyone up for this?! 
My maths wishlist!
Able to input calculations and toggle results in input fields in view mode. Results easy to display in KaTeX.
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in spirit, but perhaps not technically skilled enough.
but,
perhaps with modern LLMs
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