WinCompose is a great utility for typing in accented characters, emoji, and basically anything that Unicode can do.

This is a dumping ground for characters I actually use. WinCompose is so comprehensive that finding things is akin to a needle in a haystack (though there is search, things still require finding).

Ralt == Right Alt (Alt Gr)

Typographical

en space == Ralt Space N  (note capital, so use shift)
em space == Ralt Space M
en dash  == Ralt - - .
em dash  == Ralt - - -
Horizontal bar == Ralt - ~ -

French/German/Spanish

ú == Ralt ' u
ù == Ralt ` u
ô == Ralt ^ o = Ralt > o
ü == Ralt " u
ç == Ralt , c
ß == Ralt s s
ñ == Ralt ~ n

Quotes

‘ == Ralt ' <
’ == Ralt ' >
“ == Ralt " <
” == Ralt " >
« == Ralt < <
» == Ralt < <
‹ == Ralt . <
› == Ralt . >
„ == Ralt , ,
” == Ralt ' '
“ == Ralt ` `

Bullets

• == Ralt . =

Other

… == Ralt . .
∵ == Ralt " .
∴ == RAlt . "
ø == Ralt o /
÷ == Ralt : -