CryptoTE - CryptoTE is a text editor with integrated strong cryptography.
StyleNote Notes & Memos - StyleNote Notes & Memos app offers features that let you write noes using an extensive collection of fonts and font colors.
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.
Taskito - Taskito app offers features that let you boost up your productivity by creating lists of tasks to keep track of all your projects and life goals.
Daybreak - An intelligent to-do app that learns when to remind you
FairNote - FairNote app allows users to increase their productivity and efficiency by writing notes and by making to-do lists, so they don’t forget any important task.