JotterPad ranks high on my priority list of apps to install on any device I use and has been occupying that place for at least 3 years. It's an amazing text writer and editor that does everything I've wanted: .txt file synchronization with Dropbox or Google Drive to keep notes updated across multiple platforms, undo/redo, find, markdown support, Bluetooth keyboard shortcuts, night mode, and then some. Snapshots to go back to a previous version of a document, dictionary with a rhymes and thesaurus functionality, multiple fonts and preset looks, exporting in different file formats, and so on, JotterPad has it all.