Learn NC has a large selection of lesson plans to search through. There is a way to search through a toolbar, and there is also a section to browse lesson plans that are assorted by key words. This is a good resource for any content area teacher.
This is another website that includes interactive lesson plans for all subject areas. I took a look at the math lesson plans, and there seems to be several that looked enjoyable for the students. The interactive links state the discipline that it is used for and the audience it is meant for. Several are for the teacher to view, but there are also ones that the student can access and complete.
This website has different lesson plans sorted by grade level and state standard. The website allows you to pick which state standards you want the lesson plans are compared to.
This site will allow me to check the Standard Course of Study for English 9-12, as well as other courses and grades. I will use the site to complete unit plans, curriculums, and lesson plans.