MuseScore
Music notation program that offers a free alternative to professional programs such as Sibelius and Finale
Multimedia player for various audio and video formats as well as DVDs, VCDs, Quicktime, Real and various streaming protocols. VLC now has Chromecast support!
Versatile media player which can cover various types of audio and (HD) video formats.
Windows version of the well known multimedia player for music, movies, TV shows, and more.
Legendary multimedia player that supports music playback using MP3, MIDI, MOD, MPEG-1 audio layers 1 and 2, AAC, M4A, FLAC, WAV, OGG, and WMA (beta release).
Free YouTube Downloader downloads online videos onto your hard drive if you want to view a video offline or convert it into a format that can be stored on a mobile device.
Foobar2000 is a versatile audio player that offers native support for several popular audio formats. It can also play audio files within ZIP and RAR archives without having to extract the files in advance.
Any Audio Converter can extract audio from all popular video formats and online videos, and convert unprotected audio files to a wide range of formats.