Well herpes is listed as a STD, but other then that...none. Hepres is wide spread and about 60% of the population has it.
What if the infected person has both oral herpes and HIV virus, can he/she transmit the HIV virus by french kissing?
For practical purposes, no STDs are transmitted by open mouth (French) kissing. It could happen with syphilis, but almost never does. Oral herpes is a risk but is not considered an STD. None of the other STDs you might think of is transmitted by kissing, including gonorrhea, chlamydia, HSV2, HPV/warts, HIV, trichomonas, hepatitis, and so on.