Cryptee - Cryptee is a safety and privacy focused, encrypted and cross-platform personal data storage service. You can write personal documents, notes, journals, store photos and all sorts of other files.
Curator - The visual notes app, now on iPhone!
SocialVault - Decentralized, encrypted storage and browser for your Facebook data.
Monolog - Monolog is a note-taking tool that is: a. native b. local-first c. supports backlinks
Tresorit - Encrypted cloud storage for your confidential files. Using Tresorit, files are encrypted before being uploaded to the cloud. Start encrypting files for free.
Better Notes - Simple notes app that ties notes together with #hashtags