Signing Savvy
Signing Savvy is an extremely useful educational resource for learning ASL. The video dictionaries help you visualize the signs and practice the signs until they are committed to memory. There are several thousand videos in the dictionary that are available to you as a unregistered guest. You can sign up as a free registered guest for additional features.
ASL Pro
ASL Pro was created as a free resource for classroom teachers in sign language instruction. They have thousands of words and common phrases that are categorized into different dictionaries into video entries. They also have quizzes in fingerspelling and categories of words.
ASL University
ASLU is a fantastic resource for learning signing language. The video dictionary is not as well-stocked as Signing Savvy and ASL Pro, but they have most of the words you will encounter as a beginner. In addition, the site provides useful memory aids to help you remember signs, as well as interesting commentary about certain signs.
ASL-STEM Forum
STEM is an acronym for science, technology, engineering, and mathematics. Below is a link to a a vast dictionary of STEM-related words. There are videos on each page for words and the site is fairly easy to navigate. I have included only a select amount of the words in the pages included in this tab for math and science. For a more concentrated focus and signs for more advanced concepts, visit the link provided below.