Manuskript - Open-source tool for writers.
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Storyline Creator - An elegant tool for authors to write, organize and visualize their stories.
LightShot - The fastest way to take a customizable screenshot.