... 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.
A simple file manager for browsing and editing files and directories.
Ted is a text editor for Android, written in java
Powerful Android File Manager for everything that runs on Android OS (Android TV, Android Watch, Mobile, etc)
A text editor for Android, iOS, and web illustrating how to open and save files with the Google Drive API
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.
Text editor - Notes & ToDo (for Android) - Markdown, todo.txt, plaintext, math, ..