Norse
Freyr
peace, fertility, sunshine
Roman tradition. See the whole pantheon.

Julius Caesar claimed descent from her through Aeneas and his son Iulus. The temple of Venus Genetrix was dedicated in his forum. In Virgil, Venus is Aeneas's mother, which makes her ancestress of Rome.
Greek counterpart: Aphrodite on thegreekgods.org. Roman and Greek versions share names and stories in many places but began as different cults.
Deities in other traditions who share a theme with Venus: love, desire and fertility. This is overlap in one area only.
Norse
peace, fertility, sunshine
Norse
love, desire, magic (seiðr)
Egyptian
love, music, joy
Mesopotamian
love, war, the morning and evening star
Hindu
fortune, prosperity
Hindu
power (shakti), marriage, mountains
Hindu
love, divine play, the Gita's teacher
Celtic (Irish)
love, youth, poetry