Excel Diff compare multiple Microsoft Excel files in various formats (.csv, .xls, .xlsx, .xlsm, .xlsb, etc.) and shows their differences graphically, even for cell-level.
CellViewDiff is a free Excel add-in that can be compared to the contents of the Excel cell.
If you use together with ExcelDiff, you can use conveniently.
gCalendarSync is a software that synchronize Google Calendar with Outlook Calendar. Syncronized events can be accessed on Google Schedule from other PC, Android, and iPhone.
gTaskSync is a software that synchronize Google Tasks with Outlook Tasks. Syncronized tasks can be accessed on Google Tasks from other PC, Android, and iPhone.