Hey HN, checkout my little Free/Opensource StackOverFlow site
What we have right now that SOF lacks somehow is:
* Multi-topic: We think it’s overkill to create a new site for every subject like SOF does with serverfault and others so shapado is not limited to programming, we have a set of pre-defined categories such as technology, science, politics and more.
To visit the programming category, just point your browser to http://programming.shapado.com/ As each question can be tagged, you can even combined tags and categories that way: http://programming.visualbasic.shapado.com/ ;) Possibilities are endless. You can also combine tags, categories and languages such as http://programming.es.jquery.shapado.com or http://es.kde.shapado.com/ to get all questions about KDE in Spanish.
* Multi-language: the site is available in English, Spanish and French already. We expect more to come with the help from the community.
* Reputation: Like SOF, we have a reputation system. For now everybody is free to do everything, actually, unlike SOF you will even get points for simply posting questions or answering but this will be disabled once we get a substantial userbase… so go and ask your questions now to get loads of reputations points! We will also require a certain amount of reputation points to do certain actions in the future.
* We will provide data dumps of all our questions and answers plus an API, so that there is total data portability. Note that all the data on the site is under the Creative Commons Attribution 3.0 license so technically you can already scrap your data and take it with you ;)
* You can freely install it on your own server. Make sure to grab the source here (http://gitorious.org/shapado) or get the torrent here (http://foss.hexagon.cc/torrents/48220-Shapado_1_0), it has most of the necessary dependencies to run shapado on all platforms.
See the full announcement here: http://blog.ricodigo.com/2009/09/22/shapado-a-foss-replacement-for-stackoverflow