MadAhead - Co-write stories, poems, etc. Debate, discuss or create fun conversations.
Synology Note Station - Without needing to spend money on Evernote, Synology Note Station provides a desktop client to organize all your random notes in one place.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
UpNote - A beautiful and clean cross-platform app for notes organizer
Taskful - Deadlines, meet your match.
Notesnook - Notesnook is a simple and private note taking app that keeps your notes organized and synced on your phone, tablet and computer.