Keepmark is described as 'Desktop, privacy first documents organizer. You can organize with it your files, email, bookmarks, tasks, news, and other resources. Its available for Windows, Linux and Mac' and is a Note-taking tool in the office & productivity category. There are more than 50 alternatives to Keepmark for a variety of platforms, including Windows, Mac, Linux, Web-based and Android apps. The best Keepmark alternative is Notesnook, which is both free and Open Source. Other great apps like Keepmark are Zim, TagSpaces, CherryTree and Trilium Notes.