I use Notepad2 since ~10 years ago. Florian hasn't updated it recently, I'm on 4.2.25 now, on a Win 7 laptop. Installs easily and automatically replaces M$'s useless notepad. Lots of nice functionality like block copy & paste, sorting (ascending / descending, text / numeric, merge duplicates / remove duplicates / remove unique lines), prefix / suffix lines, et cetera. Cheers to you Florian! Surely possible to find similar functionality in other software, but with the ones I tested at the time this was the outstanding candidate and I haven't had any reason to look for an alternative.