VideoJS - VideoJS is an HTML5 Video Player, built with Javascript and CSS, with a fallback to a Flash video...
K-Lite Codec Pack - K-Lite Codec Pack is a collection of codecs, DirectShow filters and tools.
Plyr - A simple, accessible and customisable HTML5 media player
CCCP: Combined Community Codec Pack - The CCCP: Combined Community Codec Pack is a codec pack specifically built for playing videos (including mkv).
Flowplayer - Flowplayer is a video player for web sites.
AC3Filter - AC3Filter is a high quality free audio decoder and processor filter.