Trying 9front and absolutely loving it. Once you get the 'aha!' moment with acme, every other UX starts to feel dissapointing.
A plan9 version of Bombadillo would be great. Bombadillo became my default browser on termux were I spent most of my binary time enjoying the small web.

Next one in my list is project oberon. The idea of a full OS and a computer simple enough to fit on a single brain feels refreshing and exciting. 

=> http://www.projectoberon.com/ Project Oberon
=> http://9front.org/ 9front (up to date plan9 fork)


On other notes.
Starting a small capsule here at gemlog.blue for casual stuff.
Loving to explore this kind of small spontaneous non-comercial projects around gemini, pubnixes, gopher, etc.