ExploreExcel is a software product designed to make the job of documenting your spreadsheet and helping to correct any errors as simple as possible.
ExploreExcel handles any spreadsheet which Excel can import (created by Gnumeric, Open Office, etc.).

Information Provided
Excel - Version, Add-ins, options, etc.
Workbook - Who created it, when, number of worksheets, charts, etc.
Worksheets - Name, extent, hidden rows, hidden columns, visibility, protection, consolidations, circular references etc.
Cells - Displayed, formula, conditional formulae, formatting, array formulae, links to and from other cells, etc.
Charts - Name, data range, chart type, etc.
Errors - What they are and where they are
Named Ranges - Name, range, location
External links - From where, to where
Comments - All commented cells and the comment
Code behind - Any VBA code modules and if possible the code
Pivot Tables - Name, location, source data, page fields, column fields, row fields, data fields
Scenarios - Name, location, changing cells
Formula Arrays - Location, formula, cells used
Functions - What built-in and user functions are used and where
Objects - Shapes, location, type

The freeware version is limited in certain aspects, such as saving output, drill-down etc.

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