xournal - Lightweight notetaking and sketching app.
7todos - A task board for indie hackers
Xournal++ - Xournal++ is a handwriting notetaking software with PDF annotation support. Written in C++ with GTK3, supporting Linux (e.g. Ubuntu, Debian, Arch, SUSE), macOS and Windows 10. Supports pen input fr...
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Stylus Labs Write - Write is a word processor for handwriting, designed primarily for tablets with an active stylus.
Tasks - The new task app from the team that brought us Wunderlist, Microsoft To-Do is a great way to manage tasks. List everything you need to do—or import tasks from Outlook, Todoist, and Wunderlist so you don't have to start over.