Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.