Audio & Video

Dopamine is an elegant audio player which tries to make organizing and listening to music as simple and pretty as possible. This version is written using Electron, Angular and Typescript and works on Windows, Linux and Mac.

BriskPlayer is a lightweight, open-source audio player built from the classic discontinued CoolPlayer. It supports a wide range of formats including MP3, FLAC, OGG Vorbis, Opus, AAC (mp4), and WAV, with additional coverage through winamp input plugin compatibility. BriskPlayer features a simple skinnable interface with an advanced playlist editor, and an 8 band equalizer. It also includes quality-of-life features like ID3 tag support, ReplayGain, file renamer, and an MP3 to WAV converter, Discord Rich Presence, and a gettext translation engine so you can have your player in the language you speak, all while maintaining the small footprint and fast performance.

PotPlayer provides the maximum performance with the minumum resource using DXVA, CUDA, QuickSync so you can get the best out of what you have. It supports various types of 3D glasses so you can get the 3D experience anytime you want using your 3DTV or PC with various output format (Side by Side, Top and Bottom, Page Flipping) supported. Text subtitles(SMI & SRT), DVD(Vobsub) and Blu-ray subtitles, ASS/SSA animation and SMI Ruby tags, etc. are supported. Supports OpenCodec (see plugin) so users can easily add whatever codecs they want. Smooth, seamless video play. Choose which one when you have 2 sound cards. Preview the scene with snapshots. You can bookmark your favorite scene or chapter. We support Direct3D9 Ex Flip Mode and Overlay. Supports various devices such as DVD,TV,HDTV.
I have included the Twitch extension in this so you can open Twitch channels directly in the player by adding a channel URL och simply copy-paste the URL.

Audacious is an open source audio player. A descendant of XMMS, Audacious plays your music how you want it, without stealing away your computer’s resources from other tasks. Drag and drop folders and individual song files, search for artists and albums in your entire music library, or create and edit your own custom playlists. Listen to CD’s or stream music from the Internet. Tweak the sound with the graphical equalizer or change the dynamic range with audio effects. Enjoy the modern Qt-themed interface or change things up with Winamp Classic skins. Use the plugins included with Audacious to fetch lyrics for your music, display a VU meter, and more.

TwitchDownloader is simple and very powerful program to download Twitch clips or entire Vod's and save them as a video file. You can even download chat to insert it in your video.
All you have to do is insert the url to the clip or Vod and the program will do the rest.
Don't forget to show the original author some love.
 

Media Player Classic is a lightweight media player with support for a variety of audio and video formats. It is based on Media Player Classic - Home Cinema.

Media Player Classic - Black Edition (MPC-BE) is a lightweight media player with support for a variety of audio and video formats. It is based on Media Player Classic - Home Cinema.

HandBrake is a tool for converting video from nearly any format to a selection of modern, widely supported codecs.
Convert video from nearly any format Free and Open Source Built-in Device Presets
Get started with HandBrake in seconds by choosing a profile optimized for your device, or choose a universal profile for standard or high quality conversions. Simple, easy, fast. For those that want more choice, tweak many basic and advanced options to improve your encodes.
Supported Input Sources:
Handbrake can process most common multimedia files and any DVD or BluRay sources that do not contain any kind of copy protection.
Outputs:
File Containers: .MP4(.M4V) and .MKV Video Encoders: H.265 (x265 and QuickSync), H.264(x264 and QuickSync), H.265 MPEG-4 and MPEG-2, VP8, VP9 and Theora Audio Encoders: AAC / HE-AAC, MP3, Flac, AC3, or Vorbis Audio Pass-thru: AC-3, E-AC3, DTS, DTS-HD, TrueHD, AAC and MP3 tracks Even more features:
Title / chapter and range selection Batch Scan and Queueing of encodes Chapter Markers Subtitles (VobSub, Closed Captions CEA-608, SSA, SRT) Constant Quality or Average Bitrate Video Encoding Support for VFR and CFR Video Filters: Deinterlacing, Decomb, Denoise, Detelecine, Deblock, Grayscale, Cropping and scaling Live Static and Video Preview