You can find a good database of no-code tools and tutorials at:

https://www.makerpad.co

There is no good database for "low-code" tools. I've collected a whole bunch of "low-code" tools in my notes. So I am planning of creating a database for "low-code" tools (a complement to makerpad). You can follow me on twitter @anton_codes to find out when it launches.

Here are few from my notes:

https://www.8base.com/

https://hasura.io/

https://www.jexia.com/en/

https://www.netlify.com/products/functions/

https://locklock.io/

https://remaketheweb.com/