If you use free software, odds are you are using at least open source program. If you aboslutely love a particular open source program you might want to consider contributing to it. By no means do you have to be a programmer to contribute, here are a few ideas of ways you can help the project without so much as downloading the source code:

• Spread the word by either word of mouth, forum postings, blog posts, etc. The more people using the software, the better.
• Write some documentation. If you don’t want to write technical documentation, consider making forum or blog posts on how to do certain tasks.
• Donate some money. Nothing says thank you as well as cash.

Again, these are just a few ways. If nothing else, spreading the word is a simple and effective way to get more people aware of and using the program.