Apps with 'Built-in subtitle search' feature
VLC is a free and open source cross-platform multimedia player and framework. Owned by the non-profit organization VideoLAN.
Kodi, formerly XBMC, is a free and open source media player and entertainment center for Linux, Mac OS X, Windows, XBox, and iOS.
Bundleware
Several antivirus detect a potentially unwanted application (adware) PUA.FusionCore in the file F.dll dropped by the installer of PotPlayer in the Temp folder. Once that file is blocked by the antivirus, the program is installed with no problems and ads.
Minimalist video player that supports 3D video, Direct3D9 Ex Flip Mode, and sound card selection.
SMPlayer intends to be a complete front-end for MPlayer, from basic features like playing videos, DVDs, and VCDs to more advanced features like support for MPlayer filters and...
Media center allowing to watch movies, series, YouTube channels instantly. You can watch in HD, with subtitles, and easily cast any file to TV through DLNA, Chromecast, AppleTV!
Stremio also gives you notifications for new episodes / movies.
Subscene is a website where you can find subtitles for almost any movie or TV show in almost any language.