CPJ – Committee to Protect Journalists
Great Firewall of China – test if the website is censored in China
"Because of the ever stricter measures of censorship China imposes on the Internet, the team of www.greatfirewallofchina.org at present can no longer vouch for the reliability of its test tool. We have therefore decided to take the test tool offline."
ChoicePoint – intelligent solutions
fsf.org - free software (Linux)