The best alternatives to CKEditor 5 are Froala, Shosho, and Collabio® Spaces for macOS. If these 3 options don't work for you, we've listed a few more alternatives below.
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Froala builds editing software for fast development with the better developer and user experience in mind. With over 35+ plugins and 15+ natively supported frameworks, you can plug Froala and be on your way.
Comprehensive office suite for editing documents on iOS and macOS devices. Need more? Off-line real time co-authoring (no servers, no clouds, no Internet) paired with slick document arrangement in spaces! Dive in to Collabio Spaces to learn more!
A GitHub App/Action that automates the creation of issue branches (either automatically after assigning an issue or after commenting on an issue with a ChatOps command: /create-issue-branch or /cib).