RF21 is a scientific calculator, plotter, programming and numeric system in one. It allows for permanent installation of a user's own commented multivariate functions and libraries. It works as an archive at the same time, with integrated searchable database, to let you find and reuse materials created years ago. Predefined functions include the gamma, zeta, psi, and Bessel functions, error integral, cumulative Binomial distribution. On top of these and the user libraries, the program's numeric and plotting capabilities can be used. RF21 supports simple and parametric plots, several curves in one picture, printing and .BMP export. Standard libraries covering many areas, such as combinatorics, stochastics, diophantic problems, and partition numbers. Verision 0.91 features new printing utility, plot features, libraries, and documentation.