SideWriter is described as 'If you often need to quickly jot something down, SideWriter is there with a flick of the wrist' and is a Note-taking App in the Office & Productivity category. There are more than 50 alternatives to SideWriter for a variety of platforms, including Windows, Android, Mac, Online / Web-based and Linux. The best alternative is Joplin. It's not free, so if you're looking for a free alternative, you could try Standard Notes or Evernote. Other great apps like SideWriter are CherryTree (Free, Open Source), Zoho Notebook (Free Personal), Trilium Notes (Free, Open Source) and Cryptee (Freemium, Open Source).
Productivity app. Save information like a sticky notes. You can create notes with images, videos or whatever you want. Save pages to read later or capture any web content with the chrome or firefox extension. Share boards with your friends. Create public boards.
Rebel aims to provide you a distraction-free note taking experience. Focus more on writing and less on formatting and saving. As you write your note, Rebel will format it based on your markdown syntax.
Flashnote is a quick notes manager created for such cases. When you need a rough copy to save or to process some pieces of a text, Flashnote is small, quick and convenient. Press the shortcut-key combination and a rough copy is on the screen in a flash of a second.