Carbon Visualiser - See your CO2 in burgers, basketballs, pufferfish and more
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.
Wren - Offset your carbon footprint by saving rainforests
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.
Website Carbon Calculator - Find out the how much CO2 your website emits
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.