- Pocket for bookmarking. - Onenote for longer form less structured note taking on copied/linked base material or needing exposition (somewhat reluctantly). Occasionally Word. - Anything/Jetbrains : Markdown for short form or dev docsor with intuitively clear sub-structure or heirarchy. (Pseudo)Code and comments for simple codable ideas, python-like. - Scapple for mind-mapping high level concepts, collections of related ideas or things, associations rather than hierarchies