The latest release of the long-running PSI-Plot technical plotting and data processing software, PSI-Plot V. 9, incorporates 30 more features than the previous release, including a new project environment, user-defined macros, real-time plotting, support for Microsoft Access data format, and a Poisson regression function, as well as more than 100 predefined fitting models. With new plot types and axis scales, its plot wizard feature creates user-desired plots in a convenient and intuitive way.