freshbooksjs is a community supported Node.js wrapper for the Fresh Books API, an online invoicing and time tracking service. Instructions on how to implement the wrapper are documented on GitHub. The package is under MIT license and is maintained by Sabra Pratt.
When someone says, "invoicing," do you think: "speed"? Debitoor is designed to get a small business up and running fast--so you can start generating those all-important invoices and get paid faster. The Debitoor API allows a third party app to set up an invoice (such as a point-of-sale app). Debitoor is RESTful API with responses in JSON, according to the API documentation. It joins 48 accounting APIs listed in our API directory.
Twitter has just announced the availability of custom timelines, a brand new type of timelime that allows developers to have more control regarding organization and delivery of Tweets on the Twitter platform. Twitter has also announced the launch of the Custom Timelines API which is in beta and available to a small group of developers selected and approved by Twitter.