Ive just looked into all the open source implementations mentioned, to summarise:
Most active that look like the best bets
shapado Ruby, mongomapper and mongodb. Live site, also provide hosted sites for free. AGPLv3. Seems to be under active development as of June 2010.
OSQA . Django. Live site. GPLv3. More actively developed fork of CNPROG.
ASKBOT Django code, docs, import data. GPLv3. To install type "pip install askbot".
Question2Answer. Live site PHP, MySQL. Actively developed. GPL license.
CNPROG. Django. Live site(Update 21/01/2011: link leads to a page which says CNPROG is officially closed). GPLv3. Not a lot of recent activity; last code commit, Oct 2009 (as of Feb 2010). Primarily developed in Chinese, although there are English translations.
No longer supported according to the website.
Ones that look sort of finished
openoverflow. Ruby, PostgreSQL, Haml. MIT license. No example site, and I cant find anyone using this one. Not a lot of recent activity; last code commit, May 2009 (as of Feb 2010).
phpancake. PHP, Zend framework, MySQL. Live site. MIT license. Last activity Jan 2010. Renders very poorly in some browsers.
cahoots. PHP, MySQL. GPL, MIT license. Officially inactive; demo site offline; last update Aug 2010.
Qwench PHP. Example site (no pages except question list). No activity since Dec 2009.
soclone. Django framework. MIT license. Seems to have gone stale in Nov 2008 (and only started on Google Code at the end of Oct 2008).
Plurk Solace. Python. BSD license. No example site, and I cant find anyone using this one.
stacked ASP.NET, Ra-Ajax, ActiveRecord ORM. GPLv3. Live site. Seems to have gone stale in Jun 2009. Some legal issues, but they seem to be over now.
Qanda PHP, MySQL, MIT. Repository. Site inaccessible.
Others that seem to be work in progress
FortyTwo. Python, Django, CouchDB. Example site. Unknown license. Little info.
kerjakelompok. No example site. Unknown license. Little info.
SmartR. No example site. Unknown license. Little info.
Stack Underflow. C#. No example site. License is "do whatever you want with it" (I havent defined a formal license yet). Written as a learning project.
T002_rails-overflow. Rails. No example site. Unknown license. Little info. Apache license.
Did I miss any? Disagree? Please add a comment or update this answer.
And I dont really want to get into listing clones, but I have just come across Answer Bag which seems to be an all-encompassing clone covering everything from aviation through programming to religion. Or maybe that was there first? And Just Answer is another...
{var%20f='http://v.t.sina.com.cn/share/share.php?appkey=1515056452',u=z||d.location,p=['&url=',e(u),'&title=',e(t||d.title),'&source=',e(r),'&sourceUrl=',e(l),'&content=',c||'gb2312','&pic=',e(p||'')].join('');function%20a(){if(!window.open([f,p].join(''),'mb',['toolbar=0,status=0,resizable=1,width=440,height=430,left=',(s.width-440)/2,',top=',(s.height-430)/2].join('')))u.href=[f,p].join('');};if(/Firefox/.test(navigator.userAgent))setTimeout(a,0);else%20a();})(screen,document,encodeURIComponent,'','','https://wenda.whatsns.com/data/attach/logo/logo.png', '推荐 军士长司令 的问题《有没有基于 php 的类似 quora 或者知乎的开源问答平台?》','https://wenda.whatsns.com/q-298423.html','页面编码gb2312|utf-8默认gb2312'));){kind=link}
付费偷看金额在0.1-10元之间
我之前搭了一个测试站点
http://gaokao.ruchope.org
功能很齐全，主打叫做社交化问答系统，其实就是知乎这种形式啦
还可以连接微信公众平台
移动端适配比较好
不过还有很多BUG，真的是很多BUG
前端做的倒是很漂亮
社区活跃人群太少
而且它其实是商用收费的
不过就算这样在国内也算是最好的一个了
=====================
所有的开源问答系统请看这里
http://www.oschina.net/project/tag/299/qa
有一些国外类Stackoverflow的问答系统还不错
Ive just looked into all the open source implementations mentioned, to summarise:
Most active that look like the best bets
GPLv3. Not a lot of recent activity; last code commit, Oct 2009 (as of
Feb 2010). Primarily developed in Chinese, although there are English
translations.
No longer supported according to the website.
Ones that look sort of finished
Ruby, PostgreSQL, Haml. MIT license. No example site, and I cant find
anyone using this one. Not a lot of recent activity; last code commit,
May 2009 (as of Feb 2010).
Others that seem to be work in progress
C#. No example site. License is "do whatever you want with it" (I
havent defined a formal license yet). Written as a learning project.
Sorted by language
PHP
Python
Ruby
http://ASP.NET
C#
Unknown
Did I miss any? Disagree? Please add a comment or update this answer.
And I dont really want to get into listing clones, but I have just come across Answer Bag which seems to be an all-encompassing clone covering everything from aviation through programming to religion. Or maybe that was there first? And Just Answer is another...
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