ZigZag 1.3
ZigZag is a mathematical graphing tool for Windows with calculus features

ZGrapher 1.4
This graphing calculator can plot y(x), x(y), polar, parametric and table-defined functions. All your graphs and coordinate space may be fully customized. You can comment your graphs using labels and legend.

Zaitun Time Series 0.1.4
Zaitun Time Series is software designed for statistical analysis of time series data.

Z-Calculate 1.0
Z-Calculate is an innovative calculator for students, scientists etc.