I am not sure how generic these guidelines might become wrt authoring learning resources, but here a few comments which may be of general interest.

Free File Formats

Free File Formats are pre-requisite for libre knowledge (see for example this blog posting by Jimmy Wales).

Video and Animation

Jahshaka

Software libre (GPL) for audio, video editing and effects, OpenGL and OpenML APIs, real-time, 2D/3D GPU effects animation, morphing, 3D model support, paint and design on moving video, a non-linear editor, node-based compositing, GPU accelerated keyer, and more.

Blender

A libre 3D content creation suite.

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