Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Kindle Robot - Send books to Kindle via a Telegram bot 📚🤖
Shutter - Shutter is a feature-rich screenshot program.
Buch - A Telegram book reader bot
Snipping Tool - Use Snipping Tool to capture a screen shot, or snip, of any object on your screen, and then annotate, save, or share the image
FolioReaderKit - A Swift ePub reader and parser framework for iOS.