KashFlow is a full featured, web-based bookkeeping application. The main address for the site is www.kashflow.co.uk. The Web Service (API) allows external programs to query, modify and enter data into an existing KashFlow account.
It's tax time and, if you're like me, you are going through your annual reflection, wondering if there's a better service you could use. There are a number of options available on the web for amateur bookkeepers. Here are a select few that have APIs.