It's been hard to go online this week and not encounter protests against the SOPA and PIPA laws which the U.S. Congress has been considering.
There was a huge amount of pushback from online organizations, and open source projects led the way. Here's how some of the biggest reacted:
WordPress.org has an even more comprehensive protest than WordPress.com. The entire frontpage is blacked out and you need to scroll all the way to the bottom to access the main site. There's a list of plugins which will take your site offline and a blog post explaining their position.
PHP.net has completely shut down their site frontpage and replaced it with an anti-SOPA message. There's no way to reach the main PHP site today from the frontpage, but you can access internal pages directly.
Free Software Foundation
The FSF has provided much of the legal thought and support behind the success of open source projects. It's not surprising that they took a strong stand against the law and entirely blacked out: FSF.org.
Mozilla.org went black on their frontpage but allowed people to proceed to the main site via a footer link.