Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.
OI Notepad - OpenIntents is a community effort to promote and discuss the use of Android intents and similar concept of modern mobile platforms.
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.
Standard Notes - A safe place for your notes, thoughts, and life's work
FiiNote - FiiNote is the most convenient note app for android.