MoffSoft
We use this handy calculator for all computation. In our opinion, it is the best product available.

ClipMate
The native clipboard in Windows is great for cutting and pasting a single item at a time, but if you want to move a series of items, or save items for later use, then you need ClipMate!

Rather than working with one piece of clipboard data at a time, ClipMate enhances the native clipboard functionality by remembering all items (both text and graphic) that are copied to the clipboard and storing them in "collections" for later pasting. With ClipMate as a Windows companion, users will never accidentally lose a piece of clipboard data again.