Quote from Excalibur;903703:
Uh, no such thing as a free webhost without ads, you could try hosting the website on your PC.
Yes there is. They're hosts that use the Post2host approach. Instead of them putting ads on your website like I do when hosting people, a post2host service instead has you participate in their forum, requiring so many posts a month to maintain your service.
These hosts tend to be less stable than ad-driven or paid hosts though, because the profit margin from a post2host service is substantially lower than an ad-driven service.
What were you planning on making? I am the owner of SeraphimLabs LLC, a web hosting company that I established almost 3 years ago. Although most of my free plans do specify ads, I do offer a lot more flexibility in how they are implemented. Some really small project sites don't even get ads at all, as they see so little traffic that it isn't worthwhile.