I discovered something called "Kate" that came with my Suse Linux installation.

It is very close to what I am used to seeing with EditPlus (I have used EditPlus on Windows for 6 years and think it is excellent - How can you use EditPlus it on Linux, besides resorting to "wine"?) Kate supports syntax highlighting, key sequences that allow convenient navigation, copying/pasting and deletion, directory browsing and more. I am really not sure, though, what OS it comes packaged with, and whether it is Open Source (I just haven't had the time to investigate!) If anyone knows these answers, please let me know too (and don't forget the EditPlus question!)