[isnullorempty]

I used Clojure for an small application last year and once I got up and running (after watching many Rich's excellent videos and reading up) I got a glimpse of how powerful bottom up functional programming could be, a refreshing change from OOP. I wish Jetbrains would create a full featured IDE for it.

[edem]

It looks like they just did: https://cursive-ide.com/

[AsyncAwait]

It's not their IDE, but I agree that it is excellent.