Conversion of BibTeX to Endnote bibliography [02/12/2015]

As already noted in the comments: JabRef is alive and well and can do the task. But you also asked if there is another tool that can do the job. So here is my answer using bibutils:

bibutils is a collection of programs that can convert to and from MODS XML as an intermediate format.

In order to convert from BibTeX to tagged Endnote simply call:

$ bib2xml input.bib | xml2end > output.enw

Converting to RIS is similar:

$ bib2xml input.bib | xml2ris > output.ris