Variuos educational companies that are offering free subscriptions. 

I use this often with my students to elicit imitation of greetings and letter sounds (e.g. Hi A!) The students love this five minute video and I am able to get a lot of speech from them. This video series includes other learning topics such as shapes too. It's a nice way to create dialogue with the child about their itnerests.   

Eductional website for language and learning of all aged children. 

Interactive website that allows you to view and create stories for Preschoolers.

Provides interactive games for family  involvement.

This video provides scenarios of respecting other people's personal space and appropriate ways to address peers. 

This video gives examples of the effects of impatience and its resolution. This is another video used in co-teaching efforts with the preschool teachers I collaborate.

This video is a nice way to demonstrate the effects of not sharing, as well as how the child's friends react to non-sharing behavior. In addition, it shows the main character's change in behavior. I use this video while co-teaching. The students are able to identify the behavior, the reason for the behavior and why the main character changed his/her behavior through answering Yes/No questions.