FRIDA (flexible rapid interactive data analysis) is a generic program for manipulating, fitting, and plotting x,z,y data. It is primarily aimed at spectral analysis, especially in neutron scattering. Note: project has moved away from sf.net.
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Now on beta status. Maintence of a dedicated amateur server using open source software and implementeing all of them. The projects have a bug tracker, wiki, community portal, forums, mail list and a lot of more.
A numerical grid database designed for meteorological application. This is reimplementation of API shown in http://ams.confex.com/ams/Annual2005/techprogram/paper_87457.htm