SignSchool
Unlike many ASL courses that are geared toward complete beginners, Signschool lets you to choose your difficulty level: beginner, intermediate, or advanced. The portal seeks to kick-start or advance your ASL knowledge using short, easy-to-digest information, such as video courses, lessons, grammar modules, and interactive problems.
Many classes, like Lingvano, include the option to turn on your camera and practice ASL while watching the video, which provides a beneficial and dynamic practice of utilizing the language in a "real world" situation.
Although the platform has a lot of potential, it's still in beta, therefore it doesn't provide as extensive or complete a learning experience as some of its competitors. You can, however, access all current course content for free, making it a useful supplement to any ASL classes or subscriptions you may have.
Website: https://www.signschool.com/
Reasons to buy:
+Different difficulty levels
+Allows you to sign along via your webcam
+Offers special modules on grammar
+Offers quizzes and games