VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Guideblocks - Guideblocks extends your web app to provide help articles, user onboarding tours, context help...
foobar2000 - An advanced freeware audio player for the Windows platform.
Appcues - Improve user onboarding, feature activation & more — no code required! Stop waiting on dev and start increasing customer engagement today. Try it for free.
Winamp - Winamp is a media player that allows users to play multiple-file formats, arrange media in a varied file-management system, and play unique media with AAC encoding.
UserGuiding - User onboarding made easy, for less. Create product walkthroughs in a couple of clicks, without breaking the bank.