SheetSwiper

SheetSwiper converts spreadsheets containing linguistic data to Standard Format (for use with Toolbox, Phonology Assistant, Lexique Pro, FLEx, etc.)

Childishly simple
Change any column headers in the first row of the spreadsheet to the standard format markers you want to use for the data in each column. Omit markers from columns you don't want to include in the sfm. The first marker (usually in column A) will be used as the record marker. Save the file as xls (not xslx), and drag it onto the SheetSwiper window.