asciiflow - Infinite ASCII diagrams, save to Google Drive, resize, freeform draw, and export straight to text/html.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Core2D - A multi-platform data driven 2D diagram editor.
Standard Notes - A safe place for your notes, thoughts, and life's work
JavE - JavE (Java Ascii Versatile Editor) is a free Ascii Editor.
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.