What is the TL;DR of the category? What do tools in this category let you do?
These tools aim to increase productivity when writing code.
Why would I need to use it? Why would I need to start using it?
One would typically start using these tools when writing any amount of code as they can ease the effort of editing, compiling, and testing programs.
Where in the application design/pipeline is this category of tools used? Learn more.
These tools would fall in the 'meta' space of software. They exist outside the application and leave little to no trace in the final result.