Successful examples of "open-source alternatives" include OBS Studio, widely used in video and audio editing, especially among Twitch streamers. LibreOffice, with 200 million active users, serves as an alternative to Microsoft Office. uBlock Origin is a strong competitor among adblockers. In the torrent client space, qBittorrent, Transmission, and rTorrent are popular choices over proprietary options like µTorrent.