Boas & Pythons
Colubrid Snakes
Small Colubrid Snakesnakes
Ringneck Snakes
Rough Green Snakes
Garter Snakes
Ribbon Snakes
Water Snakes
Racers
Rat Snakes
Thats Just a few harmless snakes. You can google the rest.

Boas and Phythons can still be dangerous when they are large. they can not induced venoms but they can kill you by their strong muscular grips when they catch you.

with regards to water snakes, an exceptions are due to seasnakes because these snakes too are venomous.

In the Philippines, and probably other tropical countries, there are snake species that are said to be semi-aquatic, possessing fangs on the on the lower jaw, having slight venom but few species are found to have lethal venoms too