Writing

Indic Keyboard

AOSP Keyboard with Indic language support

Guileless Bopomofo Keyboard

A simple Bopomofo software keyboard (input method editor) for typing Hanyu

Print

Android print utility

Sithakuru

Libre Sinhala Keyboard

HexViewer

Hexadecimal viewer for Android

Helio

Music sequencer, designed to be used on all major platforms

TEdit

A text editor with graphical file browser.

Notes

Notebook with markdown formatting

Diary

Personal diary or journal

Nani?

Offline Japanese dictionary

Another notes app

Another notes app, like there have been tens of thousands before.

Tasks.org: Open-source To-Do Lists & Reminders

Fork of Astrid Tasks & To-Do List

Editor

Simple generic text editor

Markor

Text editor - Notes & ToDo. Lightweight. Markdown and todo.txt support.

Irregular Expressions

Virtual keyboard for writing expressive messages in various text styles

Standard Notes

A simple and private notes app

Glider for Hacker News

Glider is an opinionated Hacker News client. Ad-free, open-source, no-nonsense.

Easy Diary

A diary application optimized for user experience

Tiddloid

Tiddloid is an app to work with locally stored TiddlyWikis.

Notally | Minimalist Notes

A simple and elegant open source notes app

p!n

Pin notes to the notification area.

Delist

Focus on the task at hand

Quillnote

Take beautiful markdown notes and stay organized with task lists.

neutriNote CE

A hub of written thoughts in fast searchable plain text

Nextcloud Notes

View and edit notes on Nextcloud

Carnet

Powerful note taking app with sync and online editor

Simple Keyboard

Simply keyboard and nothing more

Orgzly

Outliner for notes and tasks in plain-text

UnicodePad

Input every character in Unicode

AnySoftKeyboard

Language pack for AnySoftKeyboard