Here are some great sources for filmakers:
Sonnyboo.com is a great source for free music, forms and templates, images, and articles.
Archive.org has free stock footage and music.
Detonationfilms.com has free stock explosion footage.
edgen.com has free music for your projects.
My sreenwriting coach! She is a great teacher and I highly recommend her. Vera Caccioppoli at Hi-Way-Haven.com