At the time I thought Workflowy had the ideal UI for everything. I wanted to implement my custom app maker on it, but ended up doing this: a platform for enhancing Workflowy with extra features:
- An email reminder based on dates input in items
- A website generator, similar to Websites For Trello, also based on Classless Templates
Also, I didn't remember this was also based on CouchDB and had some couchapp functionalities.