This post (for example) from speech pathologist Katie Lyon, under the 'tools and resources' header looks at a range of apps that can be used to make social stories (some are free, others are low-cost).
And a recent Facebook post gives advance notice of a new service that will be launched soon:
Not long until we release "Spectronics Online"! A subscription-based service giving you access to videos created by our Consultancy team of Greg O'Connor, Cha Cullen, Katie Lyon and Amanda Hartmann. Presenting guides to apps for literacy support, social stories, supporting students with autism and how to access the iPad for students with physical disabilities.