Media Players
Portable media players let you play supported audio and video files on compatible Windows PCs, sometimes from a USB drive without a traditional installation. Players differ in their codec support, subtitles, playlists, hardware acceleration, and handling of less common formats. Check each review for supported file types, current compatibility, and whether the project is actively maintained; older player builds may lack important security fixes or support for newer media formats.
General-Purpose Audio and Video Players: VLC Media Player, SMPlayer, and Media Player Classic are listed as options for playing a range of local media. Check the exact version and distribution offered on each review page, since portable packaging and support can differ from the current publisher release.
Alternative Players and Interfaces: MPlayer WW, MPUI, ALLPlayer, and KMPlayer provide different interfaces and playback features. Some entries may refer to older releases, so verify operating-system support, bundled components, and the authenticity of the download before use.
Legacy Formats and Media Utilities: FLV Player is associated with the older Flash Video format. Adobe Flash Player has reached end of life and should not be installed to browse the web or run untrusted content. SUPER combines media-related playback and conversion functions; check the review carefully to understand its actual features and current availability.
Playback Tips and Portability: If a file will not play, check the container, video and audio codecs, subtitle format, and player version before installing extra codec packs. Obtain software from a trusted publisher, and be cautious with installers that bundle unrelated offers. Portable applications may still save settings, playlists, cache files, or recent-file history on the host PC, and playback performance depends on the computer’s hardware and available codecs.

ALLPlayer is a free and portable media player. As the name suggests, it can be used to play ALL media types or formats. It also utilizes DirectX, includes a speech synthesizer, and houses its own built-in Media Conversion Tool. It has been noted as the most popular media player for watching movies with subtitles.

MPlayer WW is a powerful and portable freeware media player developed by William Wang. Based on the popular MPlayer engine, it supports an extensive list of playback formats, making it a versatile tool for playing audio and video files without the need for additional codecs. Whether you're watching a movie, listening to music, or enjoying a podcast, MPlayer WW provides smooth, high-quality playback in almost any format.

MPUI is a free media player alternative that acts as a user-friendly graphical front end for MPlayer. This versatile media player supports playback of hundreds of video and audio formats including MPEG 1, 2, 4 (DivX), H.264, MP3, Ogg Vorbis, and AAC, all without requiring additional codec installations.
MPUI can be used as a standalone free DivX player, making it ideal for playing DivX movies and DVD videos across platforms with ease.

KMPlayer is a Free Portable Media Player that can be run entirely from a USB device. It can be used to play many popular file formats, including DVD, VCD, AVI, ASF, MKV, MP4, MPEG, OGM, WMF, RealMedia, Quicktime and almost every audio file without installing additional codecs.

Media Player Classic is an Open Source Portable Media Player that can be run entirely from a USB device. It looks a lot like Microsoft Windows Media Player version 6.X. However don't be confused, this is one powerful free media player.

SMPlayer is a free portable media player. It features built-in codecs that can play back all popular audio and video formats and includes support for Chromecast. Much like the VLC Media Player that I have also reviewed, this tool can be stored and run entirely from a removable device such as a USB drive.

Portable VLC Media Player is a free, open source media player that can play almost any audio or video format without requiring additional codecs. The portable version allows you to carry VLC on a USB flash drive and run it directly on compatible Windows computers without installation.

Free FLV Player is a stand alone Portable Flash Video Player that allows users to play Adobe Flash Video (FLV) files directly from a Windows PC without requiring the Adobe Flash plugin. This lightweight viewer can open and play back .flv video files stored locally or streamed from a direct video URL. It is a simple and convenient option for users who still work with archived FLV videos and need a portable tool to view them.

SUPER Media Player: (Simplified Universal Player Encoder & Renderer) can be used to convert one type of media format to another. It can convert iPod and mobile formats as well making it a great tool for those who use portable media players.