Endnote for *nix?

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Does anyone know of an equivalent of Endnote for *nix? I am setting up an OpenBSD workstation to replace (over time) my fathers Macintosh, and while I have been able to find substitutes for all the other programs, I have not found a program like endnote. Endnote is a program which manages references in papers, so that you can input all the refs, and then have Endnote format your references for a specific scientific journal. If anyone knows of such a program, I would really appreciate it if you would help me out.