Hot Wet Tube is a tube site that's easy to use and great if you're wanting a nice mix of studio shot and amateur porn for free. The homepage shows a variety of thumbnails which can be sorted by newest, top rated, most viewed and longest. The majority of the videoclips on this site are around 5 to 8 minutes, with a few exceptions and the longest clips are around an hour long!
The categories list is probably where you're going to head for first. Simply choose a niche that you want to view and you'll be given all of the movies that match that category. You'll find all the usual options here like Amateur, Hardcore, Latina and more. When you click on a movie, you'll have to get rid of an advert before you can play the video but the plus side is that the movie player is really huge.
Underneath each movie, there are related videos and unfortunately quite a few advertising banners. There are no luxuries like pornstar directories or channels for studio porn however there is a search which actually does work! Type in something you're looking for and you'll be presented with a list that fits your search terms!