Freely downloadable resources
Gnu/Linux distribution.
Free and free media player .
Document viewer in various formats: PDF, Postscript, djvu, tiff, dvi. Free and multiplatform (Windows and Linux).
Software to compress and extract files, in various formats: ZIP, 7z, XZ, BZIP2, GZIP, TAR, WIM...
Free and multiplatform.
Free multiplatform planetarium.
Python is a dynamic object-oriented programming language that can be used for many types of software development. Free and multiplatform.
Lightweight programming-oriented text editor. Free and multiplatform.