Interactive incremental grep: https://github.com/peco/peco really really handy.
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I've been compilation buffers in Emacs recently and I really appreciate the error and warning counts shown in the modeline.
I've added the equivalent feature to deadgrep: it shows result counts! Really useful when you're doing big refactorings.
https://github.com/Wilfred/deadgrep
The most common selling point I hear for Nix is having a list of all the packages you need.
On a traditional Linux distro, I just install things and forget about them. A curated, commented list would certainly be handy when I have a new system.
What are the most interesting upcoming scripting languages? Scripting remains an important part of the programming language ecosystem.
Optimise time to first feature. Allow mutation of the running system to experiment. Interactive inspection of data.