Worth looking at free Alternatives

• Graphics, e.g.
  • Inkscape (vector graphics)
  • Gimp (photo editing)
  • Scribus (desktop publishing)
  • Blender (3D)
• Office/text, e.g. Libre Office, LaTeX (text typesetting system)
• Development, e.g. gcc, eclipse, git
• Mathematics, e.g.
  • gnuplot (visualisation of measurement data)
  • octave (numerics)
  • R (statistics)