Develve is described as 'Statistical Software for Quality Improvement,Design of Experiments (DOE), normality test, sample size calculations, Weibull analysis, Gauge R&R'. There are more than 10 alternatives to Develve for Windows, Linux, Mac, Xfce and BSD. The best alternative is R (programming language), which is both free and Open Source. Other great apps like Develve are RStudio (Free, Open Source), PSPP (Free, Open Source), JASP (Free, Open Source) and RKWard (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.
JASP is a free and open-source graphical program for statistical analysis supported by the University of Amsterdam. It is designed to be easy to use, and familiar to users of SPSS. It offers standard analysis procedures in both their classical and Bayesian form.
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.