Customize MediaWiki into Your Ultimate Collaborative Web Site - Wikipedia - Lifehacker. The free MediaWiki software is best known for powering Wikipedia, but you don't have to be writing an encyclopedia to put it to good use. Extend, skin, and customize MediaWiki to create any kind of easy-to-update, collaborative web site. When and Why MediaWiki? Step By Step: Perfect Your Picasa to Flickr Workflow. Gmail: Hack Attack: Become a Gmail master - Lifehacker.