What visas in Thailand allow for stays longer than six months for tourists?

Get married.

Elite visa you can buy a 5 year visa or 10 year

I did tourist visas back-to-back for years. I would typically leave Thailand for 2 or 3 weeks and comeback on a new visa. Sometimes I would bound across the border for lunch and comeback. This worked for me for years, 3 or 4. However it comes with risks so you should always have a plan B. Travel on Saturdays, try to route through smaller airports, etc. Its not the best option but it worked out ok for me.

Stuart and Andy are technically correct, but they both knew what you were referring to so they are just giving poor advice to punish you for your wording. Let them be. You want to stay long-term in Thailand, correct? (while working on your Laptop or wtv).

You have three long-term options: 1) Getting married to your Thai GF (if you have one) which will allow you to get a marriage extension for 1 year, renewable every year.

2) Education visa (learning Thai, self-defense, etc), which will give you 1 year, some of them renewable the year after depending on what you are learning.

3) Volunteer visa, self-explanatory, you volunteer some of your time to an organism in need.

p.s: The reason why some people use an agent for such visas is to avoid going to class or volunteering. It's basically bribing your way into these visas while staying home and doing nothing. For marriage extension, people use an agent if they do not meet the 400k baht requirement.

The STV or Special Tourist Visa gives you 90 days, and is extendable twice giving you up to 270 days.