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.