Opus Domini is described as 's easy as writing a list on paper, but powerful enough to get you where you want to go' and is a Note-taking Tool in the Office & Productivity category. There are four alternatives to Opus Domini for a variety of platforms, including Windows, Linux, Mac, PortableApps.com and Android. Most alternatives are Note-taking Tools and Calendars. The best alternative is RedNotebook, which is both free and Open Source. Other great apps like Opus Domini are MemPad (Free), EssentialPIM (Freemium) and Journée (Free, Open Source).
RedNotebook is a graphical diary and journal helping you keep track of notes and thoughts. It includes a calendar navigation, customizable templates, export functionality and word clouds. You can also format, tag and search your entries.
A simplified, RedNotebook-type journal/diary app. With a focus on minimal design and a distraction free writing environment. Makes a folder full of dated text files that are easy to access even without the journal program.