Writing

LabLog
A digital lab notebook with MQTT

PTO - Plaintext Organizer
Stay organized with one plaintext file per day.

Tasks.org: Open-source To-Do Lists & Reminders
Private, ad-free task lists! Optional sync with Google Tasks, CalDAV or EteSync!

Notesnook - Private notes app
A fully open source & end-to-end encrypted note taking app

Fitness Calendar
A private and fully offline activity tracker.

ImapNotes3
View, edit and synchronize HTML notes and check lists on your IMAP mailboxes

Standard Notes
An end-to-end encrypted note-taking app for digitalists and professionals

jtx Board journals|notes|tasks
Keep track of journals, notes & tasks - iCalendar compliant and syncable with yo

Joplin
A note taking and to-do app with sync between Linux, macOS, Windows, and mobile

Rank-My-Favs
Rank your favorite things, using simple pair-wise matchups.

SiYuan
A privacy-first, self-hosted knowledge management app

OpenSyncedLists
Create easy to sort lists

NotallyX - Quick Notes/Tasks
A simple and minimalistic open source notes app

PocketPlan
To-do list ✔️ Birthdays 🎂 Notes 📝 Shopping list 📜 Sleep reminder 💤

neutriNote CE
A hub of written thoughts in fast searchable plain text

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

Orgzly Revived
Outliner for taking notes and managing to-do lists in Org-mode format

Thunderbird: Free Your Inbox
Thunderbird is a 100% open source, privacy focused email app.

My Brain
Productivity app for Tasks, Notes, Calendar, Diary, Bookmarks and more

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

Butterfly
Powerful, minimalistic, cross-platform, opensource note-taking app

Linwood Butterfly Nightly
Powerful, minimalistic, cross-platform, opensource note-taking app

SimpleTextEditor
Simple Text Editor

Saber
The notes app built for handwriting

ntodotxt
Manage your todos in a todo.txt file

SimpleMarkdown
A simple markdown editor

Karbon
Advanced Text Editor for Power Users

MoasdaWiki App
Privacy-Friendly Knowledge Management App

Stroke Input Method (筆畫輸入法)
A minimalist Chinese keyboard.

Trime
Chinese IME with Rime Input Method Engine