eaXL is a full-function Excel interface for EA.
It is designed to be a simple round-trip interface, so you can quickly
1. export data to a spreadsheet,
2. allow non-EA users to edit it (edit rows, add rows, add their own columns - which become EA Tagged Values)
3.check their changes against what's already in EA, and finally
4.re-import their changes back in to EA.
See Getting Started