I am developing an app for time series analysis that should support the following:
- Exponential Smoothing (Holt-Winters)
- Box-Jenkins
- curve fitting (straight line, quadratic, exponential, growth)
- multiple regression
- Croston's intermittent demand model and discrete data models
- new product forecasting (Bass diffusion)
Are you familiar with open source stat packages other than R, that supports these models? (Python?)