AceProject allows you to export data to Excel and CSV formats in several areas of the interface.
First, account administrators have access to the Administration => Tools> Export Data interface page. On that page, project structure, tasks and timesheet items from one or all projects may be exported. This page also allows you to export your user list.
Many task list, task report results and time/expense report pages in the interface provide export capabilities. Just look for the Microsoft Excel icon.