DokuWiki is free and Open Source software. You can download, use and modify it without any charge.
Creating and maintaining DokuWiki takes a lot of time and resources. If you use DokuWiki in your company, please consider donating a few bucks through Paypal using the following link:
Many thanks to all donors!
If you need a invoice for your donation contact me via email. If you want to donate via bank transfer contact me for account details as well.
Individual users might be interested in buying DokuWiki Merchandising like t-shirts or mugs. You can also flattr DokuWiki.