I use an ancient version of “Judy’s TenKey”…light, portable, configurable and accurate in just the right way. The newer version is similar, a little more graphical, but equally useful.
I do NOT like TaxCycle’s tape as it is not “calculator-like”…one should be able to enter 123 - 30 {enter} and get 93 (positive). What one actually gets is 93 (negative). Goes against the grain for me to enter 123 + 30 - to get a result.
I use DoxCycle which seems to do a fine job of keeping PDFs in order for me, or I just put them in the accounting subdir in my client area. Easy, backed up and quick to locate.