It's interesting that nothing open source has emerged in this space.

Lots of choices in the closed source space. Salesforce, Airtable, Quickbase, Google AppMaker, Knack, Zoho, etc.

It takes a lot of hand holding when your "citizen developers" (legit Salesforce term) are unqualified engineers.

Unsure how that combines with open source...

BonitaSoft has an open source community edition.

Been trying to use Airtable for a few apps (project management, quotes, etc) and it just lacks enough that it can't be used practically in a reusable fashion.

Actually Yazz.com is open source and a low code environment so this is not true

Ahh, hadn't seen that before. I stand corrected.

As soon as you get something slightly complicated they tend to involve 10 times the code.

I was surprised by the omission as well.