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Good app for Android: Markor, a text editor/todo list app. Has a nice interface, markdown support, and clearly states where it puts the files and keeps them neat, and updates them from disk often, resulting in very good cooperation with Syncthing. I used to use Google Keep since it made it very easy to make and edit notes on different platforms and sync them up, but Markor+Syncthing is just as convenient, except that there's no server where the notes are stored, it's all P2P and free of Google.