I think you are thinking about OpenOffice.
This is free software where if you wish you can give a donation, but you are free to download it and use it.
It is always in production and is built by people who wanted to create a free office software solution for users and not have to use Microsoft's software.
It allows you to open all of Microsoft's well known file extensions and also save in its own format and Microsoft format too.
You can also save to PDF too.
For a freebie, its pretty good !!!
You can get it here:
http://www.openoffice.org/