Ecco Pro is described as 'The product offers three primary types of views — phone book views, calendar views, and notepad views. Central to the program's design is an outlining structure and the ability to easily manipulate information regardless of in which view it was entered' and is an app in the Office & Productivity category. There are six alternatives to Ecco Pro for a variety of platforms, including Mac, Windows, Linux, iPhone and iPad. The best alternative is Org mode, which is both free and Open Source. Other great apps like Ecco Pro are OmniOutliner (Paid), InfoQube (Paid), CrossLine (Free, Open Source) and Zavala (Free, Open Source).
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.
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.
Dashword is by far the most convenient and user-friendly tool for creating any semantic network, be it your business idea, an abstract of a lecture on computer science, a script for a movie or a recipe for your favorite dish.