What programs do you exactly use?
There are always opensource software alternatives for most paid software.
Opensource software is made by a large community and/or companies that have a shared interest in the product.
Opensource has some major benefits compared to other paid and free software.
It is completely free and open. No hidden trojans and virusses.
For office there is Libreoffice. Libreoffice is just as good word if you don’t need some special ms office features. For more information, click here.
For Adobe programs it is a bit tricky. Adobe software is fenomenal and is usually a lot better than even other paid program.
For simple and moderatly advanced photo editing there is a software package called GIMP.
If you need a special feature you can install one of the many plugins for gimp.
GIMP is a decent alternative for Adobe/Corel Photoshop. For more information click here.
For drawing there is Inkscape. I never used it but I heard it is pretty good. For more information click here.