TiddlyWiki - a non-linear personal web notebook
Sublime Text - Sublime Text is a sophisticated text editor for code, html and prose - any kind of text file. You'll love the slick user interface and extraordinary features. Fully customizable with macros, and syntax highlighting for most major languages.
Personaldb - Note taking with non-linear power
myCompiler - Run your favourite programming languages online
Roam Research - A note-taking tool for networked thought
Code.xyz - The online code editor for building APIs in a single click.