SignSchool: Learn ASL for Free is a free Android app for those who wish to learn American Sign Language (ASL). The app offers an extensive dictionary of signs from a diverse group of signers, covering a variety of topics. Users can browse the dictionary, choose a category, and reinforce their learning with multiple-choice games. Additionally, SignSchool provides a randomized sign generator called SignBuilder to help users strengthen their vocabulary. The app is user-friendly and allows learners to study at their own pace. The developers have promised more features to be added soon, making SignSchool a great choice for anyone looking to learn ASL.