Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.
C-Organizer - C-Organizer is a robust software tool designed for the professional manager that permits them to organize business activities altogether.
GitJournal - Manage your Notes from any Git Repo.
MSD Organizer - MSD Organizer one of the best software providing you a personalized experience with the complete visibility of the personal and professional manager.
Quillnote - Take beautiful markdown notes and stay organized with task lists.
OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.