Recent work
(added a quick mockup for tag streams since recording this video)
On sharing web-page fragments
Can we make Semantic Web work by allowing people to add third party structured metadata annotations to any URL?
Older projects
roam.garden - a service for publishing digital gardens from RoamResearch
iRoam - mixing in interactive computing into Roam
also see https://twitter.com/VladyslavSitalo/status/1424468125068767240 for a demo of reactive computation aspects of it
Roam Toolkit - vim navigation, SRS and various other UX improvements for Roam
Date manipulation UX improvements are "small" but I think they made a lot of difference on how nice it feels to interact with date objects in Roam. Most of that migrated and has better demos in https://github.com/Stvad/roam-date
CrowdAnki - A Plugin for Anki designed to facilitate cooperation on creation of notes and decks