FiiNote - FiiNote is the most convenient note app for android.
Nebulous Notes - Nebulous Notes is a powerful, yet simple, text editor for note-takers, writers, and coders.
jEdit - jEdit is a mature programmer's text editor with a large collection of plugins
DroidEdit - DroidEdit is a text and code editor for android tablets and phones with the following features:
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.
TextDrop - TextDrop is the fastest way to edit text files in your Dropbox using a web browser.