Good things about OpenOffice / LibreOffice

OpenOffice / LibreOffice is good for these things:

1. No need to pay for it.
2. No need to pay a monthly fee or yearly fee.
3. No activation key is necessary. 
4. No need to register. No personal details such as email addresses are required.
5. No need to buy a license for a computer or a number of computers.
6. Unlimited number of installation / reinstallation on the same computer is allowed. 
7. You are allowed to copy OpenOffice / LibreOffice and give it to your friend via a USB drive, etc.
8. Support for Windows XP, Vista, 7, 8, 10, Android and Linux.
9. Support for many kinds of language around the world.
10. Community support in the form of forum, mailing list and manual.
11. Its own file format is reliable enough to be used every day. (As long as you don't do complex things.)
12. The user interface consists of menus. It is easy to ask for help and to help your friend, e.g. "File-> Save" is easily understood, instead of graphical icons. When you ask, "How do I do this?" Your friend can reply, "Please do 'File-> Save'," and there is no "icon confusion".
13. It can open many Microsoft Office files. (Even different versions of Microsoft Office can open the same file differently.) 
14. You may choose to submit (or not to submit) a report for the developers to fix problems.
15. If you are a programmer, you can try to fix problems you found or fix those the other people found.