Climatiq Emission Tracking API - Climatiq makes it easy to automate emission calculations with a REST API.

Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.

Website Carbon Calculator - Find out the how much CO2 your website emits

Offset List - Companies that are offsetting their carbon emissions.

UberNeutral - Offset carbon emissions for every Uber you’ve taken

Track - Track is a cloud-based hospitality software to run your business, take bookings, accept payments, track marketing and calls, & manage revenue from anywhere.