Bonus action for martials from level 1, with V.Human the two I mentioned (I realise some of this may be repeated):

Shove - shield mastery
attack - Great weapon Mastery
attack - charger feet
attack - crossbow expert
attack - polearm master
grapple - tavern brawler
rage - barbarian
Vow of enmity - V.Paladin

from slightly higher levels:

attack - frenzy barbarian
ensnaring strike - ranger
hunters mark - ranger/V,paladin
Hex - bladelock
Martial arts - monk
Smite spells - paladin (although you would rarely use the spells themselves, but on occasion they are worthwhile)

Later on EKs can make bonus attacks after cantrips, bards and rangers can get swift quiver

Broadening it a bit:

Spiritual weapon - cleric
Bardic inspiration - bard
Wildshape - moon druid
Second Wind - fighter
War magic - eldritch knight
Cunning action