MagicMockups - Youtube API
MagicMockups (Free Web-based Mockup Generator)
Upload a screenshot of your system to create a fabulous mockup.
Supports several different devices (iPhones, Androids, Macbooks, Laptops, Desktops, iMacs) – useful to demonstrate what your website would look like on mobile.
Youtube iFrame API (Easily embed YouTube videos into CMSs and custom builds)
Very simple to use Javascript based API guide written by Google
Can be useful to embed training videos or guide videos directly on your solution. You can even use the API to create a “playlist” of instructional videos as well as specify the start time and end time of each video.
PowerPoint Voiceover - Record a slideshow with narration and slide timings. This could be used for training purposes. See the tutorial here.