OpenEpi seems to have many interesting features, and is mainly developed in Javascript.
It might be interesting to explore embedding some of this in DHIS2 apps:
http://www.openepi.com/BriefDoc/About.htm
http://www.openepi.com/PDFDocs/OpenEpiIntro.pdf
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Knut Staring
Dept. of Informatics, University of Oslo
+4791880522
Skype: knutstar