Font Conversion Tool allows easily convert Font extensions (otf, ttf, woff, eot). Also, the application supports the conversion of Format files to svg and back.
Full list of formats available for conversion:
eot -> otf, ttf, woff, svg
otf -> eot, ttf, woff, svg
ttf -> eot, otf, woff, svg
woff -> eot, otf, ttf, svg
svg -> eot, otf, ttf, woff