We felt the same way about Retool and that's why we built Appsmith. https://github.com/appsmithorg/appsmith

Our project has similar goals like Retool, Powerapps or other low code builders for internal tools, but we are building an open ecosystem instead of a closed one.

How close is this project to Retool? We have all the major features already so you won't miss much but we don't have all the UI widgets and native integrations yet. We'll probably reach feature parity in ~6 months.