The Wunderlist PHP SDK by Joshua de Gier allows API interaction to integrate lists into applications. Methods include login to the API, get tasks and lists, set due date for a task, and get reminders for a task.
The billable time reflected on an invoice and the actual time spent on that project are often quite different. The odd phone call here and there, the sending of emails back and forth, little amendments to work done...it all adds up to valuable working hours that often go un-accounted for. Chrometa is a service that offers automated task and time tracking with the aim of eliminating this very problem. The service also provides an the Chrometa API that enables this data to be integrated with other applications.
Here's the secret to success, the one thing you need to make sure you do the things that are important to you: add them to a task list. And the best way to make sure that list is always easily accessible? Why, write a program to incorporate it into your life. These five APIs will give you the tools to track your to-dos with minimal code.