Not sure about free, but I run my forum on http://stablehost.com and it's working perfectly. There's also some great coupons here: http://stablehostcoupons.com/ (eg 75% off your order, or 50% coupon FOR life). Ensure you purchase SSH access (which is only $1.50 extra). It has cPanel and 24/7 technical support and everything else you possibly need as well. Good luck!
P.S. I know some sneaky people are mousing over the above links to see if I put in a referral code. Don't worry, this is just a genuine and unbiased recommendation!
