Crestleaf is the newest kid on the block of genealogy websites. Joining is free, as is browsing. Since the site is new, you won’t find a huge amount of people from your family tree (unless you get very lucky) but this will change as more people join and start sharing.
You can also store family photographs. They allow you to upload 250 for free. After that, you can purchase more storage for photos. There is never any charge to add family members to your tree.
There is also a blog on the site where they provide interesting and useful information and how-to tips and it is worth checking out.
While it may not give you the bells and whistles Ancestry does, it isn’t a bad place to start for folks who don’t want to pay Ancestry’s ever increasing membership prices.