This topic contains packages to underline/overline text (including other decorations).
Produce gaps that are underlined, dotted or dashed.
Underscored LaTeX hyperlinks.
Underlining for LuaLaTeX.
Improved underlines in mathematics.
Hyphenation for letterspacing, underlining, and more.
A fancy means of underlining.
Package for underlining.
Underline text allowing line breaking.
Underlined running heads.
Shorter (and longer) underlines and underbars.
Draw wiggly lines under text.