Open Source implementations to build upon or to take code from

WebVTT-with-regions

by silviapfeiffer

Experimental implementation of regions in WebVTT building on Anne's WebVTT parser.

pdf2htmlEX

by coolwanglu

Convert PDF to HTML without losing text or format.

readability

by luin

? Turn any web page into a clean view

pandoc

by jgm

Universal markup converter