Cloud Outliner Pro is described as 'Outlines are interactive and highly customizable notes that organize your plans, projects, and ideas in a clear way. You can synchronize your records with Evernote and iCloud, share your data, and format your notes in the built-in powerful editor' and is an app. There are more than 10 alternatives to Cloud Outliner Pro for a variety of platforms, including Mac, iPhone, Online / Web-based, iPad and Android. The best alternative is WorkFlowy, which is free. Other great apps like Cloud Outliner Pro are Dynalist, Orgzly, Legend and Checkvist.
Workflowy lets you organise your brain into easily manageable lists. It also works as a single-pane outliner with inline notes. It offers one-click hoisting (zooming into branches). The online version syncs with mobile apps.
A professional list-making tool. Minimalist, keyboard-centric online outliner and task management application. Free sharing, unlimited lists, free import and export. Markdown and code support. Good for geeks 🤓 and keyboard lovers 💻.
OmniOutliner is a start-to-finish writing app. Perfect for collecting information, outlining Big Ideas, adding structure to any sort of writing, and much more. From grocery lists to email drafts to long-form composition.
Quiver is a notebook built for programmers. It lets you easily mix text, code and Markdown within one note, edit code with an awesome code editor, live preview Markdown and LaTeX cells, and find any note instantly via the full-text search.
CrossLine is an outliner with sophisticated cross-link capabilities in the tradition of the well-respected Ecco Pro. It implements the concept of "Transclusion" proposed by Ted Nelson and - among others - implemented in the legendary Objectory SE tool by Ivar Jacobson.