Dinokids

At the time of review, the site was still adding content to make the world more robust, so it's hard to say whether a subscription is worth the money. Kids can choose the dinosaur type, name, and color
for their avatar and play games -- many
of which are environmentally themed -- all for free. Younger kids
may also enjoy climbing up and down the site's ladders and levels.
However, the free version doesn't include a lot of activities, and might
not keep older kids
interested for long  (it’s probably best for kids in the 5- to
7-year-old range). The
real incentive for shelling out the cash for a site subscription?
Parental controls. You’re able to predetermine your kids’ playtime,
chat options, and site profile. If you’re hesitant to sign up for six
months or a year, there’s also an option to pay $4.25 to test the
monthly plan out, which includes a 7-day free trial. But take note: Any
plan you pick will renew automatically after you charge it to your
credit card.

Online interaction: Kids have a lot of interactive options, including two kinds of chat, multiplayer games, a "movie theater" that they can watch and discuss remotely with a friend, a screenshot-sharing tool, and more. The site uses filters and monitors to keep it clean.