Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.
CryptoTE - CryptoTE is a text editor with integrated strong cryptography.
GitJournal - Manage your Notes from any Git Repo.
Quillnote - Take beautiful markdown notes and stay organized with task lists.
Daybreak - An intelligent to-do app that learns when to remind you
FlowNote note manager - Simple and fast note taking app for the web.