From One Source:
XLnotes is an all-in-one solution to work with numbers, text, web pages and files simultaneously. Now you can use MS Excel as a base for your projects, having the functions of spreadsheet, word processor and web browser in one application. XLnotes addresses shortcomings of managing diverse information in Excel as one can either use plain text in cells or comments, but can't save formatted text, pictures or any objects in cells. XLnotes also addresses traditional rigid tree structure of outliners and offers innovative approach of combining spreadsheet structure with outliner and web browser capabilities.