see Thinking Space, Daily Writing, Daily Review, Private Wiki, Journaling, PIM, Note-Taking, Commonplace Book, Remembrance Agent, Second Brain

Every Reflective Thinker needs one.

Programmer's Notebook

Thomas Erickson built an app he called Proteus on HyperCard back in 1996. I use it to maintain a To-Do List, to keep notes on meetings, to compose and send EMail, and as a repository for information (e.g., email messages) on which I want to reflect or act later on. I keep all the information for a day on one page in a long scrolling field.

Lion Kimbro: How To Make A Complete Map Of Every Thought You Think

Some people use paper! Hipster PDA, Mole Skin, etc.

also a specific piece of software from CircusPonies

see also Google Notebook

and ZoHo notebook

and MsOneNote

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