This is a website made by the Ohio State University history department. It contains some primary sources and maps, a lot is about US history and its wars. One of the coolest things is the timelines that are pretty comprehensive.
This site is a brief overview of the American Civil War. It is sponsored by the National Park Service and includes Maps of the US during the different years of the war. It also gives chronological lists of the battles.
This is an interactive webpage that allows students to see up to date information on the current presidential race. It allows for mock scenarios and even has a quiz to try.
This is a website that describes geocaching, which is a real life communal treasure hunt around the world. It involves the use of gps to find these "geocaches" in predestined areas. This can be an excellent tool in your class incorporated with your content in any core subject.
You can try this out-- it costs per license for the good stuff. It's a great tool for visual learners and helps explore relationships between words. It also has audio clips for each word, which is helpful.
This site lists useful strategies to help students in all subjects. These strategies can be used as interventions to help improve problem areas for students.