I wish I could type all the verses to all of them, but these will give a taste. [I've put links to some favorite arrangements, although it'd probably be safe to say that my favorite arrangement of every one would be: boys choir. Some of the videos are tacky, but it's the music that counts.]
Let All Mortal Flesh Keep Silence
Let all mortal flesh keep silence,
and with fear and trembling stand.
Ponder nothing earthly minded,
for with blessing in his hand,
Christ, our God, to earth descendeth,
our full homage to demand.
A wonder sight to see,
Noël, Noël, Noël,
God's son for us is born and in a manger laid
by Mary, mother and maid,
Noël, Noël, Noël
Gaudete, gaudete, Christus est natus
ex Maria virgine, gaudete!
Tempus adest gratiae / hoc quod optabamus
carmina laetitiae / devote reddamus.
(Rejoice, rejoice, Christ is born
of the Virgin Mary, rejoice!
The time of grace has come / this that we have desired
verses of joy / let us devoutly return.
Of the Father's Love Begotten
Of the Father's love begotten
ere the world began to be
He is Alpha and Omega
He the source and ending, He
of the things that are, that have been
and that future years shall see
evermore and evermore.
O sisters, too, how may we do
for to preserve this day
this poor youngling for whom we sing
By by lully lullay (verse 1)
Herod the king, in his raging
charged he hath this day
his men of might in his own sight
all young children to slay (verse 2)
(I like to sing this especially on Dec. 28 - Feast of the Holy Innocents)
Este qu'es nascido es el gran monarca
Cristo patriarca de carne vestido
hanos redimido con se hazer chiquito
aunqu'era infinito, finito se hizera. (Verse 2)
(The newborn child is the mightiest monarch
Christ patriarchal invested with flesh
he made himself small and so redeemed us
he who was infinite became finite.)
Lo, How a Rose Ere Blooming
Lo, how a rose ere blooming
from tender branch hath sprung
of Jesse's lineage coming,
as men of hold have sung.
It came a floweret bright,
amid the cold of winter
when half spent was the night.
(I love to sing this on Dec. 19 when we pray the O Radix Iesse Antiphon)
In the Bleak Midwinter
In the bleak midwinter / frosty winds made moan
earth stood hard as iron / water like a stone.
Snow had fallen, snow on snow / snow on snow
in the bleak midwinter, long ago.
Angels and archangels / may have gathered there
Cherubim and seraphim / thronged in the air
But his mother only / in her maiden bliss
worshiped the Beloved with a kiss. (verse 3)
Noël nouvelet, Noël chantons ici
dévotes gens, crions à Dieu merci.
Chantons Noël pour le roi nouvelet
Noël nouvelet, Noël chantons ici
(New Christmas, Christmas we sing here
devout peoples, let us shout our thanks to God
Let us sing Christmas for the newborn king
New Christmas, Christmas we sing here.)
Sussex Carol
On Christmas night all Christians sing
to hear the news the angels bring. x2
News of great joy, news of great mirth
news of our merciful king's birth! (verse 1)
All out of darkness we have light
Which made the angels sing this night x2
Glory to God and peace to men
Now and forevermore, amen! (verse 4)
The Wexford Carol
Good people all, this Christmas time,
consider well and bear in mind
what our good God for us has done
in sending his beloved Son.
With Mary holy we should pray
to God with love this Christmas day.
In Bethlehem, upon that morn,
there was a blessed Messiah born.