I thought maybe someone might find these projects useful for themselves.
Preact in ClojureScript
I was always interested in having more tools to build PWAs (progressive web apps) in ClojureScript. And since cljs runtime is tiny (just 30KB) I thought it would be good to have a tiny renderer for UIs as well. That’s why I created Prum, it’s basically Rum and Sabolono ported to use Preact under the hood. Prum is almost exactly the same as Rum from user perspective, except that it is more strict about Hiccup. Because the intention of the library is to build lightweight apps, there’s no runtime Hiccup interpretation, instead it always compiles into plain React. I know at least one person who is interested in building business around PWAs in ClojureScript, so maybe you also have a use case for Prum 
CSS-in-JS for ClojureScript
So in JavaScript world there’s this new movement towards modular CSS which fits better into components way of thinking. The idea is to write CSS right in your components, which is what Garden is being used for in Clojure world. CSS-in-JS libraries are different from Garden in that they are more components centric and usually perform a number of optimizations which allows to have dynamic styles at runtime with decent performance.
cljss (Clojure Style Sheet) is a small library (most of the code is macros to compile as much as possible at build time) which I developed as an experiment, but it seems like some people found it useful and using it in production. I even got a small donation on Patreon It is mostly inspired by Emotion library. Some of the interesting optimizations it does: distinguishes static and dynamic parts of CSS and makes use of CSS Variables to update dynamic styles. It is still far from supporting all basic CSS features and maybe performance can be improved, so I’d be glad to have more contributors on board.