Apps similar to Opus Domini include RedNotebook, which is free and open source. Other options are EssentialPIM and Journée. In total there are three Note-taking Tools like Opus Domini for Windows, Linux, Android, iPhone and Mac.
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.
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The powerful, full-featured Personal Information Manager for Windows offering Email, Synchronization, Portability, Network support, Android and iOS versions.
EstoniaEU
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.
