MoinMoin supports this format with version 1.0, see MoinMoin:?action=links&mimetype=text/plain.
The http://c2.com/wiki/links.zip file from Wiki:WikiMines is an outdated printout of the C2 wiki database. The format includes "|" characters for horizontal rules. The TouchGraphWikiBrowser supports this format, and will group the child nodes according to the horizontal rule-bordered section that they appeared in.
Does anyone know if Twiki uses LinkDatabase feature? --DennisDaniels
Does anyone know if http://alt.thetinfoilhat.com/tiki-custom_home.php uses LinkDatabase? --DennisDaniels 2mar03
I suggested a LinkDatabase for ZWiki on their ZwikiDotOrg? page today. See ZWiki:LinkDatabase. --FlorianKonnertz
WxWikiServer has no LinkDatabase feature yet in v1.5.3, too. I hope it will be implemented in future there also. --TonyArmani