Javascript app for graphs & reports from OmniFocus XML data

OmniFocus is a task management application for the iPad, iPhone and Mac. Each platform runs a different version of the application with differing feature sets. They are all able to store the task tracking database as an XML file on any web server that supports WebDAV. The apps themselves handle data synchronization across devices. OmniFocus is based on Dave Allen's "Getting Things Done" (GTD) productivity system. Familiarity with GTD would probably help. In the application, tasks have a "context" (the environment where the task needs to be completed) and a project. Projects can be organized into nested folders. For example: * Projects - Freelancer (folder) - OmniFocus data visualization (project) - List job on kick starter (task, with a context "@online") More information can probably be gained from the OmniFocus website. None of the existing official applications have any kind of built-in reporting, graphing or data visualization. I'm looking for a 100% client-side Javascript program (preferably using jQuery or similar framework and a popular open-source graphing or data visualization library) to produce some basic reports. * The app will need to be told the URL for the XML data files. When using Omni's own servers this is typically https://sync.omnigroup.com/<username>/[login to view URL] * When requesting the XML file, Omni's own servers use HTTP Digest authentication -- this can probably be left to the browser to handle. * There will be one main XML file and several smaller ones. For this project, we only need the main one that will always begin with a " 00000000000000". The XML file will be ZIP'd. * Once the app has fetched the XML file and unzipped it the app should show a few tabs: 1. Main tab (default). Summary. Count of active projects and open tasks. Cumulative total of "time remaining" for open tasks. Total number of tasks completed in the last 7 days. Total number of tasks & projects completed this month. Pie chart showing open tasks per context. 2. History tab. Line graph showing number of tasks that were open per day for the last 30 days. On a second axis, show the number of active projects per day for the last 30 days. 3. Done this week tab. Table listing all tasks completed in the last 7 days. Column headings for project folders, project, context, task name, date created and data completed. Clicking column headings should sort results by that column. Clicking the same column heading a second time should reverse sort. 4. Reports tab. Show some summary graphs: - Top 10 largest projects (by number of open tasks) as bar chart - Pie chart showing number of tasks per context (repeat of the one on main tab) - Line graph showing number of tasks due per day for the next 14 days Have some drop-down boxes to allow filtering by top-level folder. Any libraries or frameworks used should be open-source & royalty free. Copyright in the code would transfer to me on payment to the developer. Ideally I'd like to open-source the result and share on github and possibly fund further work/features. I can provide sample data for testing. Happy to discuss fast & simple approaches first and be flexible on scope.