It's a really simple website which you can bookmark and go back to whenever you want, to paste or jot down any random notes you might want to whilst browsing the web.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
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.
GoodGantt - The best Gantt chart for Trello®
Buno - Simple Note Taking - Simple, minimal & easy note-taking
Paws for Trello - The best way to use Trello on your desktop
Chars - Unicode Symbols Keyboard for iOS