The best replacement for sente is papers.

The best alternatives to sente are rated as following:
★★★★★  papers
★★★★  endnote
★★★  mendeley
★★★  bookends
★★  zotero
★  papers 2
★  mathias
★  bibdesk
  papers2
  sid mathias

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Speaking about sente, one probably shouldn't forget about scrivener.

Other search terms related to sente and their ratings are:
★★★★★ scrivener
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