The first one is Footnote. As described on their website, "Footnote.com is a place where original historical documents are combined with social networking in order to create a truly unique experience involving the stories of our past." Users can upload their own primary sources that they may have in their family history, and post accounts of different historical events as it happened from their point of view. The site includes teacher resources and print resources for using it with your classroom lessons. I found one particular section to be very interesting on the USS Arizona. Footnote provides an interactive monument where you can click on the names of the deceased, and insert information about that individual (photo, personal info, etc.) to make it a more personal experience. Even though Footnote is a paid site, there are many free sections that are worth checking out. However, if you are a history teacher, it may be worth your money to invest in this site.
The second site is called 100 Milestone Documents, which posts copies of 100 primary sources important to U.S. History such as: The Declaration of Independence, Articles of Confederation, Bill of Rights, and all the way to The Voting Rights Act of 1965. The site has print resources and teacher resources for using these documents in the classroom. I was a little disappointed that some of the primary documents were difficult or impossible to read online. However, there is an option to download a hi-res copy of the document you want to view. Nice touch!