Actually org mode can do all of those things:

* Recalculate formulas a la excel: https://orgmode.org/worg/org-tutorials/org-spreadsheet-intro...

* Actually you can go way further than cloning basic excel functionality. For example, you can write inline code to generate or retrieve some data, feed that into a graphing program, and then inline the resulting chart back into the org file. https://orgmode.org/worg/org-contrib/babel/intro.html

* Display inline images: https://stackoverflow.com/questions/17621495/emacs-org-displ...