A lot of good tools in here, but a lot of the same. Two apps I don't see here but use every day:
Patterns - When I need to work out some tricky regex.
Code Runner 2 - When I need to work out a tricky function. Nice because you can run just that function and hard code some test values without the rest of the app you are working on.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.