... I send out a list of most interesting libraries and apps in the "Android" section to about 1100 subscribers.
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Android simple text editor
Simple and powerful File Editor for Android. All is licensed under the GPLv3 license.
THIS APP IS NO LONGER BEING DEVELOPED. Simple notepad app for the Android OS that can open, edit and save text files to and from the SD card.
Ted is a text editor for Android, written in java
Text editor - Notes & ToDo (for Android) - Markdown, todo.txt, plaintext, math, ..
A reusable native Android rich text editor component.
RichEditor for Android is a beautiful Rich Text WYSIWYG Editor for Android.
A text editor for Android, iOS, and web illustrating how to open and save files with the Google Drive API