Download of Pliny 1.1.0 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Design & Photo Tools, more precisely Viewers & Editors. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. This free Mac application is a product of John Bradley.
From the developer:
Pliny is a tool that works with annotations or notes that you gather as you are reading, arguably the starting point for much personal scholarly research in the humanities. It can be used with both digital (web sites, images and PDF files) and non-digital (books, printed journal articles) materials.
You may want to check out more Mac applications, such as ArchetypePlini, which might be similar to Pliny.