From AbiWiki

>=== Does Abiword have any support for footnotes and/or endnotes? ===

A: Yes, in versions 2.0 and later. The 1.0.x release series does not have footnote/endnote support. To insert a footnote or endnote, open the Insert menu and click Footnote or Endnote accordingly. To change the style of your footnotes and endnotes, open the Format menu and click Footnotes and Endnotes. You can change id schemes (numerals, letters, etc), parenthetical notation, numbering schemes, and so forth.

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