MPC-HC is lightweight, not resource intensive, and helps you play almost all the media formats on your Windows PC.
Kodi is built to provide you with a one-stop solution for all of your media viewing requirements as it allows you to play almost any media file on your Windows, Mac, Linux, Android, or iOS devices.
5KPlayer is more than just a media player. In addition to helping you play your media files, it allows you to download online video music and even do AirPlay mirroring with your iDevice.
Miro is a free and open source music and video player for Windows, Mac, and Linux computers.
AIMP is a free audio player that lets you play audio files of multiple formats on your Windows PC and Android devices.
VLC Media Player is an open source multimedia player that supports most formats and is available for multiple platforms.