This is a list of some paid software that you can find out there,, and some opensource alternatives for each one..
guide: software –> opensource alternative
- Adobe Photoshop –> gimp ( http://www.gimp.org )
- 3dMax – Cinema4D –> blender ( http://www.blender.org )
- for Email: Thunderbird (http://www.mozilla.org/en-US/thunderbird)
list will be updated regularly …
feel free to suggest some software in the comments.