NickJr.com

There are very few preschool-targeted sites that rival NickJr.com's quality content. The site, which was recently designed to be accessible on a desktop computer, mobile phone, or tablet, features games that are fun, age-appropriate, and educational, with obvious tie-ins to popular Nick Jr. TV characters. The site's video library also includes a number of clips, including some full episodes, that highlight concepts such as recycling. Random letters also are listed among the site's game and video options; they offer a word example when kids click on them.

Parents can view additional information about the appropriate age and educational intent for videos or games by clicking on the "i" icon on the screen. Instructions are generally well-explained, and characters generally say supportive things, but kids don't always get a lot of feedback when they play to help them improve on future tries. Including more input would help. It'd also be great if parents could easily find content that supports a specific learning concept to help them pick the best activities for their child. Adults can currently sort items by show or type but will have to read the additional information listed for each item to find out what kids will learn. That said, there's plenty of beneficial content on NickJr.com to help preschoolers boost their word and math skills -- and they'll also find a number of just-for-fun videos and games they'll likely be happy to watch and play.