You can use Open Office:

http://openoffice.org

Open Office is an open source (free) Word processor, spreadsheet, presentation, etc software.

You can convert files you make in Open Office to MS Word, Excel, PowerPoint...so it's easy to share docs with other people.

To answer your question, there is a "convert to PDF" button right in the navigation bar. It's super easy to create reports in Open Office and instantly convert to PDF. Great tool and I highly recommend it. If you can use MS Word, you can use Open Office. It's all very similar in its logic.