It depends on the content being shared. Sharing copyrighted material without permission is illegal. It's important to ensure that any links shared are to legal and authorized sources.
Here are some links to help you- (look in related links)
The number of links and the authority of the sites from which the links orginate.
In the links below
links
Links are listed below.
activegamez.com animecubed.com See Related Links for links to the web sites.
See the Related Links for links to two web sites about magic.
alluc.org
See the related links below for some ideas. Note to contributors: Do not include web addresses in the answer. Feel free to add links to FREE sites (as the question as asks) in the related links.
There are three popular sites at the related links below. (Addicting Games, CoolMathGames, and Bloxorz.org.UK)
There are many site. It is not appropriate to put forward individual sites as the "best sites but see the links below for some suggestions from contributors. Note: Answers should not contain links in the text. Future contributions should use the related links facility to put forward suggestions.