I've started the following page:
http://meta.wikimedia.org/wiki/Open_Source_Toolset
to collect a list of open source tools & open formats that are commonly used to support Wikimedia projects. Mainly, this is for external tools, rather than those developed within our community, though I don't mind if it is expanded to cover both.
The purpose of having this page is to better inform decision-making processes on all levels: * directing volunteers who want to help us to work on particularly useful open source projects * directing editors to tools that help them with their day-to-day work * possibly, even (when the Foundation is a bit more sustainable) considering awarding development grants to some of them, or at least helping them to pursue them by endorsing their grant proposals to other organizations * identifying key "missing pieces" that are not covered or not covered well by the existing toolset (this might be a separate list).
I know many of you use specialized tools that are not well known. There are also sure to be glaring omissions in the current list. I would therefore appreciate all help to complete it.