Well, Shree-lipi n Ankur pro r very proffessional tools. So if u wan them for office work or any type of large scale work with lots of customisation, u may go for it. or go for a Hindi pad as suggested by expert.no 2.
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Fragging is the key to Success!!!!!
If you are running Linux then just install the fonts (like devanagari or mangal) and use "Gnome Keyboard Layout Switcher" or "KDE Keyboard Tool" to select the keyboard layouts (You will require Devanagari Layout enabled). You will be able to use OpenOffice or any other editor of your choice to write in Hindi.
आप Baraha 6.0 भी इस्तमाल कर सकते हो मेरे खयाल से यह software बहुत आसन है. यह soft अंग्रेजी key map हि इस्तमाल करात है जैसे :- meraa bhaarat mahaana=मेरा भारत महान देखे :- व्व्व.बरह.चोम=www.baraha.com