DBAddin is an Excel/Word COM Add-in for database querying by userdefined functions (DBfuncs) (including a possibility for filling "data bound" controls), and a way to create special Worksheets (DBSheets) that allow for direct editing of database data.
DBAddin has finally got it's successor in .NET technology (ExcelDNA based), the new version can be found on https://github.com/rkapl123/DBAddin