Nebulous Notes - Nebulous Notes is a powerful, yet simple, text editor for note-takers, writers, and coders.
FiiNote - FiiNote is the most convenient note app for android.
DroidEdit - DroidEdit is a text and code editor for android tablets and phones with the following features:
jEdit - jEdit is a mature programmer's text editor with a large collection of plugins
OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.