
Sourceforge and Google Code are the biggest free Open Source hosting platforms and they deny access for users from certain countries.
Google Code for example denies Access from the following countries: Cuba, Iran, Libya, North Korea, Sudan and Syria.
Sourceforge from: Cuba, Iran, North Korea, Sudan, Syria

Quote from wikipedia:
Wikileaks is a website that publishes anonymous submissions and leaks of sensitive governmental, corporate, organizational, or religious documents, while attempting to preserve the anonymity and untraceability of its contributors. Within one year of its December 2006 launch, its database had grown to more than 1.2 million documents, leading to many front-page newspaper articles and political reforms. Due to financial constraints, the site has currently suspended all operations other than submission of material.
Wikileaks is important for our free internet so help to keep raising the funds necessary to keep them alive in 2010!
You can donate money at their homepage, check out http://www.wikileaks.org/
Country: South Korea

It seems that South Koreans have another layer of censorship other than the Ministry of Communication (MIC). Flickr has just created a new “Safesearch” policy that “prohibits users in these places from turning off content filters” thus censoring what one may see on flickr sites from South Korea. Apparently this idea was from Yahoo.com, which has steadily been in the process of becoming king “Tokebi” in Korea and has been a hand to censoring flickr in China as well. I guess this is all per the wishes of Yahoo shareholders who do not seem to care about censorship and do not care even when they wrongfully help put people in jail for the sake of censorship. There is more on the flickr censorship issue here.
Here are a few more blog discussion groups on this. and this synopsis and this explanation.

(source: The Marmot’s Hole)