TrustyBook 1.4 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The application relates to System Tools. This free Mac application is a product of Fabián Cañas.
From the developer:
TrustyBook offers all the features of the full paid version. It is ad-supported and an in-app purchase allows you to disable ads.
Your iPhone or iPod already replaces so many things you used to have to carry around. Let it replace one more. TrustyBook is a simple, streamlined, and customizable notebook program that lets you jot down notes with ease and style, and it's free!
You may want to check out more Mac applications, such as InsomniaT, which might be similar to TrustyBook.