Which Windows programs for more advanced users do you recommend?

An earlier answer endorsed some programs for people setting up a new Windows PC, but Joakim would like some suggestions for more seasoned users

I'm not a programmer, but I consider myself a bit more advanced than the person addressed in your answer to your article, Which programs should I install when setting up Windows 10? You mentioned Agent Ransack in the comments. Which other more advanced apps/programs would you recommend? Joakim