OpenStat is described as 'contains a large variety of parametric, nonparametric, multivariate, measurement, statistical process control, financial, and other procedures'. There are more than 10 alternatives to OpenStat for Windows, Mac, Linux, Xfce and SaaS. The best alternative is RStudio, which is both free and Open Source. Other great apps like OpenStat are PSPP (Free, Open Source), RapidMiner (Freemium), IBM SPSS Statistics (Paid) and Deducer (Free, Open Source).
PSPP is a free software application for analysis of sampled data. It has a graphical user interface and conventional command line interface. It is written in C, uses GNU Scientific Library for its mathematical routines, and plotutils for generating graphs.
RapidMiner (Community edition) is a data mining software. It was formerly known as "YALE". You can use RapidMiner as a stand-alone application for data analysis, or integrate it as a data-mining engine into your own products.
The IBM SPSS software platform offers advanced statistical analysis, a vast library of machine-learning algorithms, text analysis, open-source extensibility, integration with big data and seamless deployment into applications.
Deducer is designed to be a free easy to use alternative to proprietary data analysis software such as SPSS, JMP, and Minitab. It has a menu system to do common data manipulation and analysis tasks, and an excel-like spreadsheet in which to view and edit data frames.
SOFA Statistics is an open-source statistical package, with an emphasis on ease of use, learn as you go, and beautiful output. The name stands for Statistics Open For All. It has a graphical user interface and can connect directly to MySQL, SQLite, MS Access, and MS SQL Server.
easytab is free statistical software for industrial use. Typical usage is in smaller companies, toolshops, or directly on a production line where most of the functions of a commercial software would remain unused.