While Emacs is my primary editor, I use this editor to search and manipulate very large files. The only downside is that the text mode is much slower than the hex mode. What I typically do for a large text file is open it in hex mode, locate the relevant section (you can search for text even in this mode), and copy/paste it into a smaller text mode buffer.

Quoted: EditPad Lite: A fine text editor with all the necessary basic features. Free for non-commercial use. An ideal replacement for Notepad.